Updated docs/emacs and emacs

  * docs/emacs/emacs.org: changed location for EL files: emacs/ ->
    emacs/lisp/ (upstream [emacs] change, now emacs will warning if
    ~/.emacs.d is in load-path);
  * added one new file to (TOP)/emacs/lisp/auctex/h-wrtn: math-crts.el;
  * (TOP)/emacs/lisp/*.el: updated, tangled from above Org document;
  * (TOP)/emacs/auctex/a-gnrt: deleted unneeded files: enumitem-rus.el,
    mathgr-fix.el.

Signed-off-by: Vladimir Lomov <lomov.vl@gmail.com>