Add participant count for price set at field level

Optional "Participant Count" added to Price Set Field form. If count is set (positive integer) then each unit of that price field is multiplied by the count and added to the number of registered participants.

EXAMPLE:
Participant Count for a Price Set field for a Table of 8 at an event would be entered as 8. Each "Table" the registrant "purchases" counts as 8 participants against the maximum # of participants that the event can accommodate.

EXAMPLE:
Participant count for event where a person can by any number of tickets is entered as 1. If I buy 8 tickets - we count that as 8 participants against the max # available for the event.

For more details on this check: http://forum.civicrm.org/index.php/topic,8024.msg46956.html#msg46956