Updated docs/scripts and docs/polytech

  * scripts: added new Org document 'cft2.org'; it desribes rewritten in
    Lua script 'cft'; from this document following files are tangled
    - bin/cft2: script itself (currently don't work);
    - rc/cftrc.lua: configuration file;
    - lua/tt2rt.lua: lua module which provides 'tt2rt' function;
    - lua/test_tt2rt.lua: test file for 'tt2rt' module;
  * polytech added new Org document 'lua.org'; this is only beginning but
    it will describe rewritten in Lua script 'odb-entry'.

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