(mpuz-unsolved-face, mpuz-solved-face)

(mpuz-unsolved-face, mpuz-solved-face)
(mpuz-trivial-face, mpuz-text-face, mpuz-solve-when-trivial)
(mpuz-allow-double-multiplicator): new options for nicer look and
new features.
(mpuz-put-number-on-board, mpuz-paint-number, mpuz-solve): new
functions.
(mpuz-check-all-solved, mpuz-random-puzzle)
(mpuz-paint-statistics, mpuz-paint-digit, mpuz-close-game)
(mpuz-show-solution): functions streamlined and removed french
style space before punctuation, added face support and optional
solving of trivial results.