Implemented ticket #494 "New function 'polynomial()'"
Fixed issue #491 "Endless loops in errors from strings with language-like features"
Implemented ticket #490 "Highlight the variables in local variable definitions"
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"