MiscUtil: improved kwalitee checking tool

• New options for kwalitee checking tool: --check-all perform all checks listed below --check-some perform some (important) checks only --check-errors check Python errors --check-variables check Python variables --check-indentation check Python code indentation --check-whitespace check trailing whitespace --check-docstrings check Python doctrings compliance --check-pep8 check PEP8 compliance