Revert "Adding progressbar"

This reverts commit fe971bdeba5359c4ec05f506a7065acfcc93bd7c.
Merge remote-tracking branch 'origin/wolfia' into mj
Fixing indexer in loop
Adding doxygen comments and other stuff
Merge remote-tracking branch 'origin/mj' into mj
Reverting merge changes (mj overwrote origin/wolfia)
Removed unnecessary functions for doxygen
Small fix with setCellValue and removeCellValue
Fix found bug in SudokuGenerator.cpp
Ptaszek dla MJa