Merge 'trunk' into 'replication_dedux'

Merge 'trunk' into 'replication_dedux'

r15115@dev (orig r4575):  plu | 2008-07-15 03:36:20 -0500
Skip custom query sources

r15119@dev (orig r4579):  lukes | 2008-07-15 17:13:08 -0500
 r9099@luke-mbp (orig r4573):  lukes | 2008-07-14 13:11:13 +0100
 new branch
 r9100@luke-mbp (orig r4574):  lukes | 2008-07-14 15:01:50 +0100
 reordered methods of Versioned.pm and factored the initialisation stuff from upgrade to install
 r9128@luke-mbp (orig r4576):  lukes | 2008-07-15 23:07:38 +0100
 major versioning doc refactor
 r9129@luke-mbp (orig r4577):  lukes | 2008-07-15 23:11:10 +0100
 removed EXPERIMENTAL notices

r15120@dev (orig r4581):  ash | 2008-07-16 11:41:52 -0500
Update docs re txn_scope_guard
r15158@dev (orig r4590):  groditi | 2008-07-17 15:22:40 -0500
 r20694@martha (orig r4588):  groditi | 2008-07-16 16:17:07 -0400
 _is_deteministic_value

r15159@dev (orig r4591):  groditi | 2008-07-17 15:22:50 -0500
 r20836@martha (orig r4589):  groditi | 2008-07-17 16:21:07 -0400
 Changes and AUTHORS