Patch adding a general admission seating type & pricing options

I have spent a little time adding code to beta3. The major changes in this patch are:

• Added support for a third type of ticket. It now supports reservations for general admission, in addition to seating at tables and in chair rows. General admission is a ticket for any available general admission seat, rather than a specific reserved seat.
• Added regular and reduced ticket prices for each of the 3 types, giving a fuller range of pricing options.
• Added ability to offer a group discount if desired. For example, buy more than 15 tickets and get $1.00 off each one.
• The reduced price can be chosen for each selected ticket with a checkbox.
• Added a function to consistently calculate this more complex pricing model.

Aside from that, there are a variety of cosmetic changes to the appearance of things. Hope you like it!
Oh, and you will be able to see the beginnings of a function to call paypal for payment. Obviously that can change depending on what module you want to use.