Merge 'multiple_version_upgrade' into 'trunk'

r8304@Thesaurus (orig r8292):  nigel | 2010-01-13 16:05:48 +0100
Branch to extend ::Schema::Versioned to handle series of upgrades
r8320@Thesaurus (orig r8308):  nigel | 2010-01-14 16:52:50 +0100
Changes to support multiple step schema version updates
r8321@Thesaurus (orig r8309):  nigel | 2010-01-14 17:05:21 +0100
Changelog for Changes to support multiple step schema version updates
r8393@Thesaurus (orig r8380):  ribasushi | 2010-01-19 13:59:51 +0100
Botched merge (tests still fail)
r8395@Thesaurus (orig r8382):  ribasushi | 2010-01-19 17:37:07 +0100
More cleanup
r8396@Thesaurus (orig r8383):  ribasushi | 2010-01-19 17:48:09 +0100
Fix last pieces of retardation and UNtodo the quick cycle
r8442@Thesaurus (orig r8429):  ribasushi | 2010-01-26 14:18:53 +0100
No need for 2 statements to get the version