Fix incompatibilities with 24.3.93's python-mode.

* removed the function `python-indent-electric-colon' which is
  subsumed by `python-indent-post-self-insert-function'. Just
  inserting a colon triggers a call. Affects `arv-py-electric-colon'.

* removed the variable `python-indent-dedenters'. Affects
  `arv-py-outline-level' which I dont' use. Comment it off.


git-svn-id: svn://localhost/emacslib/emacslib/trunk@442 a9598837-e506-0410-a967-fbf0066ee963