changes to allow asset_source to be specified in the opensim.ini

this will work for sqlite and nhibernate, but will be ignored for
mysql and mssql (reverting to their ini files) until someone writes
that bit.

OpenSim/Data/MySQL/MySQLAssetData.cs

@@ -170,6 +170,13 @@ namespace OpenSim.Data.MySQL
 
         #region IPlugin Members
 
+        override public void Initialise(string connect)
+        {
+            // TODO: This will let you pass in the connect string in
+            // the config, though someone will need to write that.
+            Initialise();
+        }
+
         override public void Initialise()
         {
             IniFile GridDataMySqlFile = new IniFile("mysql_connection.ini");