Updated docs/polytech

  * scripts.org: complete implementation of current (new) workflow,
    updated script for old workflow to use new DB format:
    - bin/odb-entry: tangled from Org document;
    - odb/: directory for all other tangled files, except
    - templates/ex-pol-{p,s}-tmpl.ltx: these ones;
    - odbmgr/: updated.

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