files: do not try to do autorevert history with Emacs 24.4

This is already implemented.
init: do not disable electric-indent-mode for python

The support is quite better in Emacs 24.4
erc: try to fix bug about channel names not requested

However, this doesn't seem to work...
Revert "erc: try to fix bug about channel names not requested"

This reverts commit 48254d0e647cc1cc90db4c6d2ba2f20183b6c4d9.
org: enable babel python support