.vimrc: remove some unused plugins

I think pylint and/or pep8 wouldn't shut up when building C code. Really
annoying. I have not used them for a long time anyway.

I don't remember what it is with Superior_Haskell_Interaction_Mode_SHIM,
but I've had it disabled for a long time. So just commit it.
.vimrc: add jedi-vim - an awesome Python autocomplete plugin

It completes automatically when typing the '.' in
someobject.<cursor-here> or with Ctrl-x Ctrl-o (which I've mapped to
Ctrl-space).

  http://jedi.jedidjah.ch/en/latest/
.ssh/config: update