Add a plugin running Python in a dockable window.
Manually set Python location for OS/X. CMake is broken (see http://public.kitware.com/Bug/view.php?id=14809) and symbolic linking also doesn't work.
Include local site packages in Python path.
Merge branch 'master' into python
Run Ninja after creating build files.
Merge branch 'python' into dataplugin
Track which of a DataSet's variables is tracking the variable-of-integration.