Merge 'trunk' into 'replication_dedux'

r12028@dev (orig r4378):  captainL | 2008-05-11 13:43:58 -0500
added test for find or create related functionality in nested inserts
r12029@dev (orig r4379):  captainL | 2008-05-11 14:03:27 -0500
sanified new multi_create test
r12030@dev (orig r4381):  ribasushi | 2008-05-12 06:09:20 -0500
Add failing tests for missing safeguards for multilevel prefetch (don't know the internals well enough to fix the issue itself)

diff --cc t/77prefetch.t
Simple merge