Changes from V2.0 to V2.1

	absences are now editable.

	bug fixed that prevented changes to the .holiday and .tradeshow files
	from getting propagated without re-starting the server

	Holidays/Tradeshow info windows are handled just like absence windows:
	they do not need to be dismissed before another
	holiday/tradeshow/absence can be viewed. The window gets re-used.
