Threads must be exited from check cleanly even though it takes small amount of time. Just terminating thread can have unpredictable side-effects (even weird crashes).
The number of threads is now atleast 1.
Added a very simple about dialog with version number and license.
Replaced all CppCheck's with Cppcheck.
Renamed "show more errors" to "show possible false positives" in the menu.
User created application now has to have a name and a path.