The user account management is now a little more flexible (its API). This
was done create the usersbygroup module. The change a minimal and
should be invisible in all other dialogs. The changes simply allow
a client code to specify which part of the dialog (user account) must
be shown/edit-able. Originally, this limitation was kind of hard coded
based on the user account type.
For example, when editing POP accounts, there are no privilege section,
the shell is not shown and the group is fixed. The users_edit() function
now receive a bitmap (USRACCT_EDIT____ in userconf.h) telling how
to handle the dialog.