Merge 'trunk' into 'oracle_hierarchical_queries_rt39121'

r9318@Thesaurus (orig r9305):  rabbit | 2010-05-05 11:49:51 +0200
 r9296@Thesaurus (orig r9283):  ribasushi | 2010-05-01 11:51:15 +0200
 Branch to clean up various limit dialects
 r9297@Thesaurus (orig r9284):  rabbit | 2010-05-01 11:55:04 +0200
 Preliminary version
 r9301@Thesaurus (orig r9288):  rabbit | 2010-05-03 18:31:24 +0200
 Fix incorrect comparison
 r9302@Thesaurus (orig r9289):  rabbit | 2010-05-03 18:32:36 +0200
 Do not add TOP prefixes to queries already containing it
 r9303@Thesaurus (orig r9290):  rabbit | 2010-05-03 18:33:15 +0200
 Add an as selector to a prefetch subquery to aid the subselecting-limit analyzer
 r9304@Thesaurus (orig r9291):  rabbit | 2010-05-03 18:34:49 +0200
 Rewrite mssql test to verify both types of limit dialects with and without quoting, rewrite the RNO, Top and RowNum dialects to rely on a factored out column re-aliaser
 r9305@Thesaurus (orig r9292):  rabbit | 2010-05-03 21:06:01 +0200
 Fix Top tests, make extra col selector order consistent
 r9307@Thesaurus (orig r9294):  ribasushi | 2010-05-04 00:50:35 +0200
 Fix test warning
 r9308@Thesaurus (orig r9295):  ribasushi | 2010-05-04 01:04:32 +0200
 Some databases (db2) do not like leading __s - use a different weird identifier for extra selector names
 r9313@Thesaurus (orig r9300):  rabbit | 2010-05-05 11:08:33 +0200
 Rename test
 r9314@Thesaurus (orig r9301):  rabbit | 2010-05-05 11:11:32 +0200
 If there was no offset, there is no sense in reordering
 r9315@Thesaurus (orig r9302):  rabbit | 2010-05-05 11:12:19 +0200
 Split and fix oracle tests
 r9317@Thesaurus (orig r9304):  rabbit | 2010-05-05 11:49:33 +0200
 Changes

r9321@Thesaurus (orig r9308):  rabbit | 2010-05-05 13:01:35 +0200
Changes
r9322@Thesaurus (orig r9309):  rabbit | 2010-05-05 13:02:39 +0200
Fix obsucre bug with as_subselect_rs (gah wrong commit msg)
r9323@Thesaurus (orig r9310):  rabbit | 2010-05-05 14:56:38 +0200
Forgotten pieces
r9329@Thesaurus (orig r9316):  rabbit | 2010-05-07 10:15:52 +0200
Failure to determine dbms version is *not* a fatal error - trap exceptions
r9330@Thesaurus (orig r9317):  caelum | 2010-05-07 11:57:24 +0200
detect row_number() over support in MSSQL if version detection fails
r9331@Thesaurus (orig r9318):  caelum | 2010-05-07 14:56:57 +0200
minor change
r9332@Thesaurus (orig r9319):  nigel | 2010-05-07 15:03:00 +0200
empty update OK even if row is not in database
r9333@Thesaurus (orig r9320):  nigel | 2010-05-07 15:28:06 +0200
Added reference to cascade_* in relationship attributes
r9334@Thesaurus (orig r9321):  nigel | 2010-05-07 15:39:37 +0200
empty update OK even if row is not in database (fixed)
r9335@Thesaurus (orig r9322):  nigel | 2010-05-07 15:48:19 +0200
empty update OK even if row is not in database (fixed2)
r9336@Thesaurus (orig r9323):  nigel | 2010-05-07 15:54:36 +0200
Clarification to cascade_update attribute documentation
r9337@Thesaurus (orig r9324):  nigel | 2010-05-07 16:08:17 +0200
Clarification cascade_* attribute defaults documentation