Well. I followed your instructions and aparently all were fine but... nothing happens. Wiki is empty. When I reviewed Terminal this is what I was:
servidor:~ admin$ sudo psql -U _postgres -f $HOME/dumpall.psql postgres
You are now connected to database "postgres".
psql:/Users/admin/dumpall.psql:15: ERROR: role "_devicemgr" already exists
ALTER ROLE
psql:/Users/admin/dumpall.psql:17: ERROR: role "_postgres" already exists
ALTER ROLE
psql:/Users/admin/dumpall.psql:19: ERROR: role "caldav" already exists
ALTER ROLE
psql:/Users/admin/dumpall.psql:21: ERROR: role "collab" already exists
ALTER ROLE
psql:/Users/admin/dumpall.psql:23: ERROR: role "roundcube" already exists
ALTER ROLE
psql:/Users/admin/dumpall.psql:35: ERROR: database "caldav" already exists
psql:/Users/admin/dumpall.psql:36: ERROR: database "collab" already exists
psql:/Users/admin/dumpall.psql:37: ERROR: database "device_management" already exists
psql:/Users/admin/dumpall.psql:38: ERROR: database "roundcubemail" already exists
…...
You are now connected to database "caldav".
psql:/Users/admin/dumpall.psql:78: ERROR: relation "resource_id_seq" already exists
ALTER TABLE
SET
psql:/Users/admin/dumpall.psql:102: ERROR: relation "addressbook" already exists
ALTER TABLE
psql:/Users/admin/dumpall.psql:120: ERROR: relation "addressbook_bind" already exists
ALTER TABLE
psql:/Users/admin/dumpall.psql:132: ERROR: relation "addressbook_home" already exists
ALTER TABLE
psql:/Users/admin/dumpall.psql:144: ERROR: relation "addressbook_home_metadata" already exists
ALTER TABLE
psql:/Users/admin/dumpall.psql:162: ERROR: relation "addressbook_object" already exists
ALTER TABLE
psql:/Users/admin/dumpall.psql:176: ERROR: relation "revision_seq" already exists
ALTER TABLE
psql:/Users/admin/dumpall.psql:199: ERROR: relation "addressbook_object_revisions" already exists
ALTER TABLE
psql:/Users/admin/dumpall.psql:213: ERROR: relation "apn_subscriptions" already exists
ALTER TABLE
psql:/Users/admin/dumpall.psql:231: ERROR: relation "attachment" already exists
ALTER TABLE
psql:/Users/admin/dumpall.psql:244: ERROR: relation "calendar" already exists
ALTER TABLE
psql:/Users/admin/dumpall.psql:256: ERROR: relation "calendar_access_type" already exists
ALTER TABLE
psql:/Users/admin/dumpall.psql:274: ERROR: relation "calendar_bind" already exists
ALTER TABLE
psql:/Users/admin/dumpall.psql:286: ERROR: relation "calendar_bind_mode" already exists
ALTER TABLE
psql:/Users/admin/dumpall.psql:298: ERROR: relation "calendar_bind_status" already exists
ALTER TABLE
psql:/Users/admin/dumpall.psql:310: ERROR: relation "calendar_home" already exists
ALTER TABLE
psql:/Users/admin/dumpall.psql:322: ERROR: relation "calendar_home_metadata" already exists
ALTER TABLE
psql:/Users/admin/dumpall.psql:351: ERROR: relation "calendar_object" already exists
ALTER TABLE
psql:/Users/admin/dumpall.psql:363: ERROR: relation "calendar_object_attachments_mode" already exists
ALTER TABLE
psql:/Users/admin/dumpall.psql:379: ERROR: relation "calendar_object_revisions" already exists
ALTER TABLE
psql:/Users/admin/dumpall.psql:391: ERROR: relation "calendarserver" already exists
ALTER TABLE
psql:/Users/admin/dumpall.psql:403: ERROR: relation "free_busy_type" already exists
ALTER TABLE
psql:/Users/admin/dumpall.psql:417: ERROR: relation "instance_id_seq" already exists
ALTER TABLE
setval
--------------------------------------------------------
-----------------------
psql:/Users/admin/dumpall.psql:32401: ERROR: relation "contacts" already exists
ALTER TABLE
psql:/Users/admin/dumpall.psql:32423: ERROR: relation "identities" already exists
ALTER TABLE
psql:/Users/admin/dumpall.psql:32437: ERROR: relation "identity_ids" already exists
ALTER TABLE
setval
--------
1
(1 row)
psql:/Users/admin/dumpall.psql:32458: ERROR: relation "message_ids" already exists
ALTER TABLE
setval
--------
1
(1 row)
psql:/Users/admin/dumpall.psql:32490: ERROR: relation "messages" already exists
ALTER TABLE
psql:/Users/admin/dumpall.psql:32505: ERROR: relation "session" already exists
ALTER TABLE
psql:/Users/admin/dumpall.psql:32519: ERROR: relation "user_ids" already exists
ALTER TABLE
setval
--------
1
(1 row)
psql:/Users/admin/dumpall.psql:32544: ERROR: relation "users" already exists
ALTER TABLE
psql:/Users/admin/dumpall.psql:32587: ERROR: duplicate key value violates unique constraint "identities_pkey"
DETAIL: Key (identity_id)=(1) already exists.
CONTEXT: COPY identities, line 1: "1 1 2011-10-31 17:28:05.382256+01 0 delmod \N delmod@servidor.ivance.net \N \N \N 0"
psql:/Users/admin/dumpall.psql:32604: ERROR: duplicate key value violates unique constraint "session_pkey"
DETAIL: Key (sess_id)=(jrt154upbs4hic4nv8asau20eentq5do) already exists.
CONTEXT: COPY session, line 1: "jrt154upbs4hic4nv8asau20eentq5do 2011-10-31 17:29:30+01 2011-10-31 17:29:30+01 192.168.11.20 bGFuZ3V..."
psql:/Users/admin/dumpall.psql:32613: ERROR: duplicate key value violates unique constraint "users_pkey"
DETAIL: Key (user_id)=(1) already exists.
CONTEXT: COPY users, line 1: "1 delmod servidor.ivance.net 2011-10-31 17:28:05.341198+01 2011-10-31 17:28:05.341198+01 es_ES "
psql:/Users/admin/dumpall.psql:32621: ERROR: multiple primary keys for table "cache" are not allowed
psql:/Users/admin/dumpall.psql:32629: ERROR: multiple primary keys for table "contactgroupmembers" are not allowed
psql:/Users/admin/dumpall.psql:32637: ERROR: multiple primary keys for table "contactgroups" are not allowed
psql:/Users/admin/dumpall.psql:32645: ERROR: multiple primary keys for table "contacts" are not allowed
psql:/Users/admin/dumpall.psql:32653: ERROR: multiple primary keys for table "identities" are not allowed
psql:/Users/admin/dumpall.psql:32661: ERROR: multiple primary keys for table "messages" are not allowed
psql:/Users/admin/dumpall.psql:32669: ERROR: relation "messages_user_id_key" already exists
psql:/Users/admin/dumpall.psql:32677: ERROR: multiple primary keys for table "session" are not allowed
psql:/Users/admin/dumpall.psql:32685: ERROR: multiple primary keys for table "users" are not allowed
psql:/Users/admin/dumpall.psql:32693: ERROR: relation "users_username_key" already exists
psql:/Users/admin/dumpall.psql:32700: ERROR: relation "cache_created_idx" already exists
psql:/Users/admin/dumpall.psql:32707: ERROR: relation "cache_user_id_idx" already exists
psql:/Users/admin/dumpall.psql:32714: ERROR: relation "contactgroups_user_id_idx" already exists
psql:/Users/admin/dumpall.psql:32721: ERROR: relation "contacts_user_id_idx" already exists
psql:/Users/admin/dumpall.psql:32728: ERROR: relation "identities_user_id_idx" already exists
psql:/Users/admin/dumpall.psql:32735: ERROR: relation "messages_created_idx" already exists
psql:/Users/admin/dumpall.psql:32742: ERROR: relation "messages_index_idx" already exists
psql:/Users/admin/dumpall.psql:32749: ERROR: relation "session_changed_idx" already exists
psql:/Users/admin/dumpall.psql:32756: ERROR: relation "users_alias_id_idx" already exists
psql:/Users/admin/dumpall.psql:32764: ERROR: constraint "cache_user_id_fkey" for relation "cache" already exists
psql:/Users/admin/dumpall.psql:32772: ERROR: constraint "contactgroupmembers_contact_id_fkey" for relation "contactgroupmembers" already exists
psql:/Users/admin/dumpall.psql:32780: ERROR: constraint "contactgroupmembers_contactgroup_id_fkey" for relation "contactgroupmembers" already exists
psql:/Users/admin/dumpall.psql:32788: ERROR: constraint "contactgroups_user_id_fkey" for relation "contactgroups" already exists
psql:/Users/admin/dumpall.psql:32796: ERROR: constraint "contacts_user_id_fkey" for relation "contacts" already exists
psql:/Users/admin/dumpall.psql:32804: ERROR: constraint "identities_user_id_fkey" for relation "identities" already exists
psql:/Users/admin/dumpall.psql:32812: ERROR: constraint "messages_user_id_fkey" for relation "messages" already exists
servidor:~ admin$