Merge 'trunk' into 'sybase'

Merge 'trunk' into 'sybase'

r20554@hlagh (orig r7595):  wreis | 2009-09-07 09:31:38 -0400
improved warn for Storable hooks in ResultSourceHandle
r20558@hlagh (orig r7597):  ribasushi | 2009-09-07 10:26:59 -0400
Whoops - last_insert_id allows for multiple autoinc columns - support it in pg
r20560@hlagh (orig r7598):  ribasushi | 2009-09-07 10:46:14 -0400
Prune duplicate constraints from the find() condition
r20578@hlagh (orig r7603):  frew | 2009-09-08 14:13:29 -0400
Turn IDENTITY_INSERT back off after inserts