Sage 100: Add ability for FAS 50, FAS 100 and Sage MAS Fixed Assets to support companies with 13 Periods

Add the ability to use Sage FAS 50 Fixed Assets and Sage FAS 100 Fixed Assets with companies using 13 periods or other alternate calendars. For example, companies in the retail or manufacturing industry who run on a 5/4 week fiscal period.

Currently, only Sage FAS 500 Fixed Assets is compatible with alternate calendars.