Merge 'and_or' into 'trunk'

r5860@Thesaurus (orig r5859):  arcanez | 2009-04-07 18:37:24 +0200
 * branch to work on -and => [], -or => {}
r5862@Thesaurus (orig r5861):  arcanez | 2009-04-08 04:47:47 +0200
fix for hashref $logic
r5969@Thesaurus (orig r5968):  arcanez | 2009-04-24 00:03:03 +0200
readd the failing test back in
r5970@Thesaurus (orig r5969):  ribasushi | 2009-04-24 00:16:41 +0200
Strip some parenthesis for easier reading

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