Merge 'trunk' into 'prefetch'

r5696@rkinyon-lt-osx (orig r5695):  robkinyon | 2009-03-06 12:55:52 -0500
Changed how the EXPERIMENTAL tag for subqueries and as_query is noted
r5697@rkinyon-lt-osx (orig r5696):  ribasushi | 2009-03-06 12:56:54 -0500
Remove erroneously merged file

diff --cc lib/DBIx/Class/Manual/Cookbook.pod
Simple merge

diff --cc lib/DBIx/Class/ResultSet.pm
Simple merge

diff --cc lib/DBIx/Class/ResultSetColumn.pm
Simple merge