Merge 'trunk' into 'sybase'

Merge 'trunk' into 'sybase'

r9155@hlagh (orig r7288):  caelum | 2009-08-10 04:13:19 -0400
make _determine_driver more reentrant
r9161@hlagh (orig r7294):  michaelr | 2009-08-10 16:40:33 -0400
Added exception when resultset called without an argument

r9162@hlagh (orig r7295):  andyg | 2009-08-10 18:34:13 -0400
Add failing test for RT 47779, group_by as a scalar ref
r9165@hlagh (orig r7298):  ribasushi | 2009-08-11 03:52:03 -0400
Extra intro pod
r9166@hlagh (orig r7299):  mo | 2009-08-11 07:20:37 -0400
removed TODO test
r9167@hlagh (orig r7300):  ribasushi | 2009-08-11 08:16:28 -0400
Sanify group_by handling in complex prefetch rewrites
r9168@hlagh (orig r7301):  ribasushi | 2009-08-11 11:52:49 -0400
cleanup
r9169@hlagh (orig r7302):  ribasushi | 2009-08-11 13:40:59 -0400
Whitespace
r9170@hlagh (orig r7303):  ribasushi | 2009-08-11 14:00:11 -0400
Fix an obscure regression when inserting an object with a serialize-deflating column set
r9177@hlagh (orig r7311):  ribasushi | 2009-08-12 10:11:24 -0400
Remove needless inflate in Ordered
r9178@hlagh (orig r7312):  ribasushi | 2009-08-12 10:13:48 -0400
Remove leftovers from frew's tests
r9179@hlagh (orig r7313):  ribasushi | 2009-08-12 10:16:08 -0400
Grrrr
r9182@hlagh (orig r7314):  ribasushi | 2009-08-13 01:40:44 -0400
Caelum was right to make _get_dbh private - reverting (and some code refactoring)
r9183@hlagh (orig r7315):  ribasushi | 2009-08-13 01:41:43 -0400
Add a db/txn_do retry debugger (interesting results)
r9184@hlagh (orig r7316):  ribasushi | 2009-08-13 01:42:51 -0400
Adjust the storage DESTROY and the tests to accomodate the new global RaiseError=1
r9185@hlagh (orig r7317):  ribasushi | 2009-08-13 02:12:08 -0400
Last bit