Improved the implementation of #630
Fixed issue #630 "if clauses accept command sequences"
Fixed an oversight in implementation of #622
Fixed issue #622 "GUI scaling at higher display scalings"
Fixed issue #627 "Statistics and selecting multiple columns or rows"
Fixed issue #635 "Calling 'clear' or 'delete' on a nonexistenttable should not throw an error"
Implemented tickets #637 and #640 "Use OpenMP for statistics of large tables" "Use OpenMP for matop functions"
Fixed issue #639 "Static code analyzer glitch with 'var', etc."
Implemented ticket #597 "Add 2d fft"
Improved implementations of #606 and #601 - Found an oversight in the virtual terminal cursor - Removed some large bottlenecks in the calculation of stats in tables