Fix price bump warning display

The price bump warning now only displays if the attendee's badge
actually costs anything, so now group members claiming a new badge won't
see it.
Fix phone display in admin form

The phone number had the wrong column name. Fixed so it actually
displays the group leader's phone number on the group admin page.
Allow dealers to add badges

Dealers can now add badges to their group based on the number of tables
they have
Rewrite dealer confirmation page

Changes the text on the dealer confirmation page to outline the
registration process better.