Add a separate mode for .dir-locals.el

[Clément Pit-Claudel]

Hi all,

.dir-locals.el files are currently opened in emacs-lisp-mode, but they are not 
proper Emacs Lisp files; as a result, Flymake generates incorrect diagnostics, 
and I don't know of an easy way to customize Emacs specifically for these files 
(there's is no hook that runs every time a dir-locals file is opened).  We've 
had a similar problem for a while in Flycheck.

The attached patch creates a trivial dir-locals-mode, derived from 
emacs-lisp-mode, and removes Flymake backends in that mode.

Thoughts?
Clément.

0001-Add-a-separate-mode-for-.dir-locals.el-files.patch
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