user control updates

added 'strict' option to _get_input
fixed error in _get_input for select=mandatory
required strict usernames in login, userman, localuserman and inviter
disabled username change in edit-login
in localuserman, if you have the LOCALUSERMAN_MAKE_PUBLIC privilege and you try to create a user with an email that belongs to an existing user, you get the option of making the existing user public and loading it into the form
big warning on localuserman when opening public user for editing