Updated docs/openbox

  * rc.org: added combination 'W-/' to show/hide fullscreen urxvt (kuake
    style);
  * (TOP)/{openbox/rc.xml,data/openbox/win.txt}: updated (tangled) from
    Org document.

Signed-off-by: Vladimir Lomov <lomov.vl@gmail.com>
Updated docs/emacs and docs/polytech

  * emacs/emacs.org: fix spell typos;
  * polytech/scripts.org: make odb source modular;
  * updated (tangled) files, (TOP)/:
    - bin/odb-entry;
    - odb/edit-entry;
    - odb/gen-pdf;
    - odb/new-entry;
    - odb/store-entry;
    - templates/ex-pol-s-tmpl.ltx.

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