* py-clients/komwordofday.py (komwordofday.append_occurences): Use
the new lexer instead of splitting on WORDSPLIT.
(WORDSPLIT): Constant removed.
(add_words): Use words_in_body() instead of splitting on
WORDSPLIT.
(Terminal): New class.
(Word): New class, inherited from Terminal.
(Space): Ditto.
(Begin): Ditto.
(End): Ditto.
(Junk): Ditto.
(words_in_body): New function.
(lexer): New function.  Split a string into a list of the
Terminal-derived classes above.
(Parser): New class.  Compute a list of Word objects that appear
to be proper words, using heuristics of the acceptable sequences
of Terminal-derived classes.