Implemented ticket #481 "Open package creator independent from the active file"
Implemented ticket #482 "Add a diff viewer to the version control system"
Implemented ticket #484 "Version control menu in the tabs menu"
Fixed some Doxygen warnings
Implemented ticket #486 "Add a possibility to jump to a procedure from the dependency viewer"
Implemented part of ticket #287 "Refactor built-in.cpp"
Implemented ticket #489 "'load DATA -tocache' shall use the table name in new file format"
Started with refactoring of built-in.cpp (tickets #287 and #489)
Implemented ticket #488 "Synchronize the layouts of string and numerical calculations"