Merge 'trunk' into 'bool_operator'

r6291@Thesaurus (orig r6290):  ribasushi | 2009-05-17 00:45:12 +0200
Test and fix for obscure where-cond modification
r6292@Thesaurus (orig r6291):  ribasushi | 2009-05-17 01:25:10 +0200
Release 1.55
r6453@Thesaurus (orig r6452):  mo | 2009-05-29 15:41:22 +0200
added failing test for -desc => \['colA LIKE ?', 'test']
r6454@Thesaurus (orig r6453):  ribasushi | 2009-05-29 17:41:10 +0200
Fix for _order_by with bind values - will not work on DBIC - needs matching changes to SQLAHacks
r6455@Thesaurus (orig r6454):  mo | 2009-05-29 18:28:54 +0200
order_by: added passing test
r6461@Thesaurus (orig r6460):  ribasushi | 2009-05-30 10:10:38 +0200
Do not join hash order conditions early
r6466@Thesaurus (orig r6465):  ribasushi | 2009-05-30 18:35:46 +0200
Release 1.56

diff --cc lib/SQL/Abstract.pm
Simple merge