Whitespace cleanup

[Jordi Gutiérrez Hermoso]

Elisp code almost invariably contains a mixture of tabs and spaces.
Whenever I open a new elisp file, I almost always have to turn on
whitespace-mode and guess what tab width, if any, makes it this
mixture of tabs and spaces ident and align properly.

Can we fix this at least for the elisp shipped with Emacs? It
shouldn't be a big deal. All modern diff programs, including bzr's
own[1] can ignore whitespace changes.

Thanks,
- Jordi G. H.

[1] https://bugs.launchpad.net/qbzr/+bug/327317