[bp/r45365][SEC] Register passcode: If passcode fails, also prevent user tracker item from being created.

git-svn-id: file:///var/local/code.tiki.org/tikisvn/branches/6.x@45368 b456876b-0849-0410-b77d-98878d47e9d5
[bp/r45319][SEC]Login passcode: Add option to show passcode on registration form. Together with r45368, helps avoid unauthorized user trackers from being created upon registration

git-svn-id: file:///var/local/code.tiki.org/tikisvn/branches/6.x@45369 b456876b-0849-0410-b77d-98878d47e9d5