Remove lispref/locals.texi

Remove lispref/locals.texi
Ref: http://lists.gnu.org/archive/html/emacs-devel/2012-02/msg00702.html

* doc/lispref/locals.texi: Remove file.
* doc/lispref/elisp.texi, doc/lispref/vol1.texi, doc/lispref/vol2.texi:
Don't include locals.texi.  Remove menu entry.
* doc/lispref/errors.texi, doc/lispref/maps.texi: Adjust node pointers.
* doc/lispref/internals.texi (Buffer Internals):
Remove cross-refs to locals.texi.
* doc/lispref/Makefile.in (srcs): Remove locals.texi.

* admin/FOR-RELEASE: Related markup.