Version 1.0		09-11-2010	Initial release
Version 2.0		02-03-2011	Calculations based upon priority
Version 2.1		03-03-2011	Days used in calculation are working days (ie excluding weekends)
Version 2.11	03-03-2011	Bugfix
Version 3.0		08-06-2012	Added option to set duedays by Project/category