Pylint improvements

by Boris FELD for Python Software Foundation

Pylint is currently widely used by Python Community but pylint is quite old (about 10 years old) and the need for modernization begins to emerge. First, a lot of tickets are open (currently 184 open tickets), some since several years. Moreover parsing pylint output is not so easy and several request for JSON output has been triggered. Finally improve python-3000 compatibility will help python developpers to move to python-3000.