Fernando Oliveira's Postgress SQL Server Data Connector as a single commit.

* Added PostGreSQL support
* Added MySQL/MySQLXGroupData.cs
* PostgreSQL data access implementation
* PostgreSQL dll binarie and RegionStore.migrations
* Migrations Scripts from MSSQL to POSTGRES
* Postgres SQL Type fixes
* Postgres SQL Connection string
* Data type issues
* more fixes
* tests and +tests
* UUID x string - FIGHT!
* Fixed PG types to internal csharp types
* More data type fix (PostgreSQL fields are case sensitive) :(
* more field case sensitive fixes
* changed the migration files to be case sensitive for fields.
* fixed fields case
* finished converting, now search for hidden bugs.
* some more fixes
* bool type fixed
* more case fixes;
* creatorID case fixed
* case fields fixed
* fixed default now() for TMStamp fields with don't allow nulls.
* fix case sensitve for Region name and Estate name
* fixed case for names for search
* fix class name Error
* Bug fixed on select and migrations
* Un-Reverting my change due to Postgres issue with the ILIKE function
* Fixed some issued for Diva Distro
* Fixes for integration with Diva Distro
* Added System.Core to prebuild.xml for PG project
* Configured to make DIff for Push to OpenSim Project
* Diffs only to PostgreSQL mods.

OpenSim/Data/PGSQL/Resources/IM_Store.migrations

@@ -0,0 +1,26 @@
+:VERSION 1         # -------------------------- 
+
+BEGIN Transaction;
+
+Create Sequence im_offiline_id increment by 1 start with 1;
+
+CREATE TABLE im_offline (
+  "ID" integer PRIMARY KEY NOT NULL DEFAULT nextval('im_offiline_id') ,
+  "PrincipalID" char(36) NOT NULL default '',
+  "Message" text NOT NULL,
+  "TMStamp" timestamp NOT NULL default now()
+);
+
+COMMIT;
+
+:VERSION 2         # -------------------------- 
+
+BEGIN;
+
+/*
+INSERT INTO `im_offline` SELECT * from `diva_im_offline`;
+DROP TABLE `diva_im_offline`;
+DELETE FROM `migrations` WHERE name='diva_im_Store';
+*/
+
+COMMIT;