Simplify code.
Added libx to sys.path.
Merge branch 'pip_joern' into pip_lib

Conflicts:
	run.py
Removed double insert libx.
Simplified if.. else.. statements.
Removed unused code.
Small refactoring of "exec_pip_commands".
Removed excess string formatting.
Removed excess formatting of strings.
Added main/lib to .(git|hg)ignore.