Revert "core: Select all when validating make deployment by proxy selects"

This reverts commit ae12782f43f450cdb1fc7c00952d3bfd2a10d657.

This breaks the MembersTpl widget (secondary groups and others).
mail: mail delivery can be disabled
ppolicy: lock account when disabling user
base: remove the disable option, it's confusing

Since it just changes the shell to /bin/false it does not have much
impact as users usually doesn't use UNIX services with a shell on the
server.
base: show enable user button too