Merge 'trunk' into 'sybase'

Merge 'trunk' into 'sybase'

r5735@hlagh (orig r6812):  castaway | 2009-06-27 21:11:08 -0700
Tests for grouping with prefetch

r5742@hlagh (orig r6819):  ribasushi | 2009-06-28 04:00:03 -0700
The prefetch+group_by is a complex problem - branch
r5766@hlagh (orig r6843):  abraxxa | 2009-06-29 02:02:17 -0700
fixed typo in test

r5779@hlagh (orig r6847):  ribasushi | 2009-06-29 10:09:00 -0700
Minor Ordered optimization (don't use count)
r5787@hlagh (orig r6855):  caelum | 2009-06-29 14:42:11 -0700
 r5451@hlagh (orig r6605):  caelum | 2009-06-10 09:23:44 -0700
 new branch to implement on_connect_call
 r5484@hlagh (orig r6633):  caelum | 2009-06-11 11:03:10 -0700
 on_connect_call implementation and set_datetime_format support for Oracle
 r5492@hlagh (orig r6641):  caelum | 2009-06-11 16:39:28 -0700
 connect_call_set_datetime_format for Oracle, I have no idea why this didn't get committed before...
 r5504@hlagh (orig r6655):  caelum | 2009-06-12 17:28:06 -0700
 finished up on_connect_call stuff
 r5507@hlagh (orig r6658):  caelum | 2009-06-13 04:03:36 -0700
 fixup _setup_connect_do, other minor cleanups
 r5508@hlagh (orig r6659):  caelum | 2009-06-13 04:35:33 -0700
 make the on_(dis)?connect_do accessors returnn the original structure
 r5509@hlagh (orig r6660):  caelum | 2009-06-13 08:31:52 -0700
 allow undef for _setup_connect_do
 r5522@hlagh (orig r6679):  caelum | 2009-06-14 09:56:40 -0700
 rename connect_do store
 r5621@hlagh (orig r6769):  caelum | 2009-06-23 07:38:33 -0700
 minor doc update
 r5628@hlagh (orig r6777):  caelum | 2009-06-23 16:36:12 -0700
 properly test nanosecond precision with oracle and datetime_setup
 r5669@hlagh (orig r6784):  caelum | 2009-06-24 10:49:25 -0700
 IC::DT does support timestamp with timezone
 r5768@hlagh (orig r6846):  caelum | 2009-06-29 08:20:32 -0700
 remove DateTime from 73oracle.t
 r5781@hlagh (orig r6849):  caelum | 2009-06-29 13:07:43 -0700
 remove the _store stuff for on_connect_do
 r5785@hlagh (orig r6853):  ribasushi | 2009-06-29 14:38:30 -0700
 Some beautification