Merge 'sybase_bulkinsert_support' into 'sybase_support'

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