Implemented ticket #784 "Improve error message handling"
Improved implementation of ticket #781
Implemented ticket #783 "Unresolved procedure commands shall throw an error"
Implemented ticket #782 "Improve new file dialog"
Fixed issue #781 "Brace autocompletion does not work on non-DE keyboards"
Implemented ticket #779 "Add checks for the correct column type in all necessary commands"
Fixed an issue introduced with #722
Deleted obsolete branch for ticket #650
Implemented ticket #650 "Read and write arbitrary ZIP files"
Improved implementation of ticket #650