Merge 'sybase_support' into 'trunk'

Merge 'sybase_support' into 'trunk'

r20728@hlagh (orig r7703):  ribasushi | 2009-09-20 18:51:16 -0400
Another try at a clean sybase branch
r20730@hlagh (orig r7705):  ribasushi | 2009-09-20 18:58:09 -0400
Part one of the sybase work by Caelum (mostly reviewed)
r20731@hlagh (orig r7706):  ribasushi | 2009-09-20 19:18:40 -0400
main sybase branch ready
r21051@hlagh (orig r7797):  caelum | 2009-10-18 04:57:43 -0400
 r20732@hlagh (orig r7707):  ribasushi | 2009-09-20 19:20:00 -0400
 Branch for bulk insert
 r20733@hlagh (orig r7708):  ribasushi | 2009-09-20 20:06:21 -0400
 All sybase bulk-insert code by Caelum
 r20750@hlagh (orig r7725):  caelum | 2009-09-24 02:47:39 -0400
 clean up set_identity stuff
 r20751@hlagh (orig r7726):  caelum | 2009-09-24 05:21:18 -0400
 minor cleanups, test update of blob to NULL
 r20752@hlagh (orig r7727):  caelum | 2009-09-24 08:45:04 -0400
 remove some duplicate code
 r20753@hlagh (orig r7728):  caelum | 2009-09-24 09:57:58 -0400
 fix insert with all defaults
 r20786@hlagh (orig r7732):  caelum | 2009-09-25 21:17:16 -0400
 some cleanups
 r20804@hlagh (orig r7736):  caelum | 2009-09-28 05:31:38 -0400
 minor changes
 r20805@hlagh (orig r7737):  caelum | 2009-09-28 06:25:48 -0400
 fix DT stuff
 r20809@hlagh (orig r7741):  caelum | 2009-09-28 22:25:55 -0400
 removed some dead code, added fix and test for _execute_array_empty
 r20811@hlagh (orig r7743):  caelum | 2009-09-29 13:36:20 -0400
 minor changes after review
 r20812@hlagh (orig r7744):  caelum | 2009-09-29 14:16:03 -0400
 do not clobber $rv from execute_array
 r20813@hlagh (orig r7745):  caelum | 2009-09-29 14:38:14 -0400
 make insert_bulk atomic
 r20815@hlagh (orig r7747):  caelum | 2009-09-29 20:35:26 -0400
 remove _exhaaust_statements
 r20816@hlagh (orig r7748):  caelum | 2009-09-29 21:48:38 -0400
 fix insert_bulk when not using bulk api inside a txn
 r20831@hlagh (orig r7749):  caelum | 2009-09-30 02:53:42 -0400
 added test for populate being atomic
 r20832@hlagh (orig r7750):  caelum | 2009-09-30 03:00:59 -0400
 factor out subclass-specific _execute_array callback
 r20833@hlagh (orig r7751):  caelum | 2009-10-01 11:59:30 -0400
 remove a piece of dead code
 r20840@hlagh (orig r7758):  caelum | 2009-10-03 15:46:56 -0400
 remove _pretty_print
 r20842@hlagh (orig r7760):  caelum | 2009-10-04 16:19:56 -0400
 minor optimization for insert_bulk
 r21050@hlagh (orig r7796):  caelum | 2009-10-18 04:56:54 -0400
 error checking related to literal SQL for insert_bulk