check directories consistency only for local files

prepare to fix WEB-6584 Files opened by URL should also be able to open scripts used in the file
fixed PY-12819 Unable to run GAE nosetests

Regression produced in 67046c75

PyCharm actually has python specific libraries and such libraries should be included in Python Path in PyCharm.
Created special Python library type to mark this kind of libraries.
Merge remote-tracking branch 'origin/master'
Start plugins wizard #26 better color for selection (Darcula), hide dialog buttons when in "Customize plugin group" mode
method references: super methods treatment in exact check