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v2.7.3
	* Multiple improvements for importing from GradeScope and BlackBoard
	* Some protection against SQL injection
v2.7.2
	* Fixed bug on not recovering sorting column which contains spaces
	* Table header and name related columns are sticky and always visible
	* Columns with Totals pushed forward
	* Added imports from Gradescope and Blackboard
v2.7.1
	* Sorting Info and Note category alphanumerically
v2.7.0
	* Added text like column types Info and Note they do not count for
	statistics
	* New column type AdmissionScore intended for special total calculated
	as average
	* Added javascript to toggle visibility of controls
v2.6.3 - v2.6.6
	* Adopted to use css style for sticky on top (always visible) grades
	  table header. Super handy for a class with a lot of students
v2.6.2
	* Web page is in utf8 encoding
	* Class grades histogram generation and display
	* Weighted column show hard coded 1 as maximum possible
	* Grade and histogram have their own styles
	* Using skipAplus settings from config
	* More elegant display of the grading scheme
	* If database is read only and does not have the grading scheme do not
	  complain at normal level about inability to create it
	* If histogram limits are empty do not show the histogram marker
	* Added javascript to toggle visibility of histogram marker and grading scheme
	* Above javascript sets cookies for visibility, so far same for all
	  classes for a given user
v2.6.1 
	* Users can see grading scheme
	* Added grades in the column histogram calculation (not yet displayed)
	* Added profiling script
	* Small bug fixes in non web scripts
v2.6.0 
	* Instructor can assign letter grade cutoffs via web
	* If letter grade schema table missing we create it on a fly
	* Letter grade can have A+
	* Better debug logging with location of proc
v2.5.2 
	* Class generating script loads json module too
v2.5.1 
	* Log file records user group
v2.5.0 
	* css style improved, so the grades table does not stick out so ugly
v2.4.9 
	* properly setting the column for the sorting cookie
	* marking the column for sorting in the html output
	* grave Error is reported via log facility
v2.4.8  
	* log is written in JSON format
v2.4.7  
	* CSS changes in highlighted row and table border style
v2.4.6  
	* Participant number is not modifiable now
v2.4.5  
	* Added numbered participant list display
v2.4.4  
	* banner import improved, now we grab CRN number too
	* converted README to the pandoc markdown dialect
v2.4.3  
	* photos of students can be cached locally now
v2.4.2  
	* added photos of students to the table view
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