Updated tex/latex/isuth-modules

  * note.dcf, olympiad.dcf: added note to test 'H' style for vector macro;
  * polytech.dcf, problems.dcf, refbook.dcf: use 'H' style for '\vect'
    macro, might cause problems with typesetting.

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