minor code cleanup
fix for assignment extension type.
some simple DB validator, used only in tests.
DB validator improvements.
Merge branch 'master' of github.com:Evolveum/midpoint
Merge branch 'master' of github.com:Evolveum/midpoint
Merge branch 'master' of github.com:Evolveum/midpoint
Merge branch 'master' of github.com:Evolveum/midpoint
db validator moved to test module.
Merge branch 'master' of github.com:Evolveum/midpoint