Backed out changeset 7a58581d842c This changeset breaks a number of CW tests, which depends on pre add hooks. I'm backing it out, so that we can start the need-for-speed sprint with green tests (and possibly rework this changeset)

if not rql('CWConstraintType X WHERE X name "RQLUniqueConstraint"',
           ask_confirm=False):
    rql('INSERT CWConstraintType X: X name "RQLUniqueConstraint"',
        ask_confirm=False)