Merge 'trunk' into 'replication_dedux'

r13636@dev (orig r4470):  blblack | 2008-06-05 01:57:09 -0500
_verify_pid mods _dbh, so we must call it again here
r13637@dev (orig r4471):  blblack | 2008-06-05 02:21:42 -0500
remove a line from the threads test that had the potential to mask bugs, and copy it to a new "threadtxn" test too, which uses a txn_do in each thread to do the same stuff

diff --cc lib/DBIx/Class/Storage/DBI.pm
Simple merge