Big cleanup across the entire project

The cleanup consisted in a couple of changes:

 * import only modules, not objects, in order
   to not clutter the module namespace and to not
   leak accidentally objects which aren't public API
   for the said modules.

 * use two spaces between module level functions

 * move some mixins from astroid.node_classes in
   the proper order, starting at the left,
   not being last in the MRO.

0 files changed, 0 insertions, 0 deletions