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/XAssetStore.migrations

@@ -0,0 +1,27 @@
+# -----------------
+:VERSION 1
+
+BEGIN;
+
+CREATE TABLE XAssetsMeta (
+  "ID" char(36) NOT NULL,
+  "Hash" char(32) NOT NULL,
+  "Name" varchar(64) NOT NULL,
+  "Description" varchar(64) NOT NULL,
+  "AssetType" smallint NOT NULL,
+  "Local" smallint NOT NULL,
+  "Temporary" smallint NOT NULL,
+  "CreateTime" integer NOT NULL,
+  "AccessTime" integer NOT NULL,
+  "AssetFlags" integer NOT NULL,
+  "CreatorID" varchar(128) NOT NULL,
+  PRIMARY KEY ("ID")
+);
+
+CREATE TABLE XAssetsData (
+  "Hash" char(32) NOT NULL,
+  "Data" bytea NOT NULL,
+  PRIMARY KEY ("Hash")
+);
+
+COMMIT;