Merge 'trunk' into 'sybase'

Merge 'trunk' into 'sybase'

r5559@hlagh (orig r6713):  caelum | 2009-06-18 16:03:01 -0700
fix broken link in manual
r5571@hlagh (orig r6725):  ribasushi | 2009-06-19 08:25:19 -0700
 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