Merge 'trunk' into 'count_distinct'

r6110@Thesaurus (orig r6109):  plu | 2009-05-02 21:11:40 +0200
Failing testcase for using subselect (as_query)
r6111@Thesaurus (orig r6110):  ribasushi | 2009-05-03 02:00:19 +0200
Failing test without immediate fixes go to branches, not to trunk
r6114@Thesaurus (orig r6113):  ribasushi | 2009-05-03 10:23:28 +0200
Bump SQLA ependencies so parenthesis_significant is guaranteed to be there
r6127@Thesaurus (orig r6126):  arcanez | 2009-05-05 09:27:56 +0200
 r6037@mullet (orig r6036):  arcanez | 2009-04-30 01:24:41 -0700
 branch to work on Sybase/MSSQL subtleties
 r6038@mullet (orig r6037):  arcanez | 2009-04-30 01:27:11 -0700
 jump to ::DBI::Sybase::MSSQL if we are using MSSQL through Sybase
 r6062@mullet (orig r6061):  arcanez | 2009-04-30 14:05:24 -0700
 fixes for MSSQL via Sybase
 r6126@mullet (orig r6125):  arcanez | 2009-05-05 00:27:13 -0700
 add a line to Changes and add a CAVEAT