visualize n=52 as playing cards

Using the Unicode symbols for the different
suits, plus the number or one of "JQKA".

The sequence number is still displayed in
case the user is not dealing with playing cards.
emphasize sequence number on playing cards with #

E.g. 10 of hearts is #23. (Currently. Not sure
the ordering is good.)
improving UI for entering message
adding pagelet for capacity label in the UI