Code contributors:

Volker Dirr (to contact Volker Dirr visit http://www.timetabling.de/)
	Lots of helping with testing, bug reports, suggestions, comparisons
	
	XHTML generation code modified by Volker Dirr (timetabling.de) from old html generation code
	(old code by Liviu Lalescu)
	added features: - xhtml 1.0 strict valide
		- colspan and rowspan using
		- times vertical
		- table of content with hyperlinks
		- css and JavaScript support
		- print rooms timetable
		- TIMETABLE_HTML_LEVEL
		- print groups and years timetable
		- print subjects timetable
		- print teachers' free periods timetable

	Import and export of CSV files
	
	Export of advanced statistics