Finalize dealer registration

Allows dealers to kick-in while applying, and fixes a bug introduced in the admin form for groups.
So in master, we pull all table numbers from TABLE_OPTS, and simply change the pre-reg form to display only 1 through MAX_DEALER so we can only show the correct number of table options.

However, this used int_options, which meant we couldn't offer dealers half-tables. We had to switch to just displaying all of TABLE_OPTS instead, and restrict TABLE_OPTS to just the public-facing options.

Of course, when I did that, it meant that admins couldn't set the table to "0" or above "4" - so anytime an admin edited a group, they gave it a table. This adds additional options just for admins.