Merge 'unresolvable_prefetch' into 'trunk'

r6360@Thesaurus (orig r6359):  arcanez | 2009-05-21 20:18:52 +0200
branch to work on prefetch/select
r6361@Thesaurus (orig r6360):  arcanez | 2009-05-21 20:32:46 +0200
failing test
r6373@Thesaurus (orig r6372):  ribasushi | 2009-05-22 11:07:26 +0200
Simplify unresolvable test by arcanez
r6905@Thesaurus (orig r6904):  ribasushi | 2009-07-01 12:54:03 +0200
Extend test
r6950@Thesaurus (orig r6949):  ribasushi | 2009-07-03 00:14:09 +0200
Apparent fix - simply delay the in_storage flagging of the main object until all prefetched objects are inflated. The rest of the changes are just cosmetics, preparing for the collapse_result rewrite