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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
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