Merge 'prefetch_limit' into 'trunk'

r6706@Thesaurus (orig r6705):  ribasushi | 2009-06-18 12:30:08 +0200
Branch to attempt prefetch with limit fix
r6709@Thesaurus (orig r6708):  ribasushi | 2009-06-18 15:54:38 +0200
This seems to be the prefetch+limit fix - ugly as hell but appears to work
r6710@Thesaurus (orig r6709):  ribasushi | 2009-06-18 16:13:31 +0200
More comments
r6717@Thesaurus (orig r6716):  ribasushi | 2009-06-19 15:39:43 +0200
single() throws with has_many prefetch
r6718@Thesaurus (orig r6717):  ribasushi | 2009-06-19 15:40:38 +0200
Rename test
r6719@Thesaurus (orig r6718):  ribasushi | 2009-06-19 15:44:26 +0200
cleanup svn attrs
r6720@Thesaurus (orig r6719):  ash | 2009-06-19 16:31:11 +0200
Add extra test for prefetch+has_many

r6721@Thesaurus (orig r6720):  ribasushi | 2009-06-19 16:33:49 +0200
no need to slice as use_prefetch already has a limit
r6722@Thesaurus (orig r6721):  ribasushi | 2009-06-19 16:36:08 +0200
throw in an extra limit, sophisticate test a bit
r6723@Thesaurus (orig r6722):  ribasushi | 2009-06-19 16:36:54 +0200
Fix the fix
r6725@Thesaurus (orig r6724):  ribasushi | 2009-06-19 17:24:23 +0200
Fix dubious optimization