v2.4.1  
	* when single user grade updated, propagates total and stats on all table
v2.4.0  
	* added single user grade change capability
	* speed up for updates with transaction wrapping
	* fixes in the html formating
v2.3.3  
	* removed start/end for stats updates, values were not saved into the table.
v2.3.2  
	* added statistics info for mean, median, and stdev
	* reworked start/end transaction logic, now it is safe for recursive calls
v2.3.1  
	* now we have default permission which are used of DB does not set them
v2.3.0  
	* added statistics info i.e. the highest and the lowest score
v2.2.2
	* added usage section to some of the scripts
v2.2.1
	* small speed ups with transaction usage
v2.2.0
	* Added drop the lowest grades logic
	* small improvements in error messaging (can output location of the caller)
v2.1
	* Access to grades database wrapped in one transaction for speed 
	* Improved and sped up update grades logic
	* Recoverable column deletion
	* there is a way to speed profile code, see ./test_weight_calc.tcl 

v2.0
	* One password database for all classes for all users
	* logger accept human readable message priority level