Implemented ticket #625 "Variable viewer improvements"
Fixed some issues introduced with implementation of #642
Implemented ticket #644 "Create matop function for calculating the length of a polygon"
Implemented ticket #642 "Improve 'new' command"
Implemented ticket #603 "timeformat() and to_time() shall support ms and µs"
Implemented ticket #628 "Autodetect date/time in files and pasted tables"
Implemented ticket #611 "Create a try-catch statement"
Implemented ticket #623 "Add tabs to the documentation browser"
Implemented ticket #641 "Improve resampler"