Fixing bugs:
cardwords_gtkclient:

* Show the meaning of wildcards during move creation also on the card-table.


Adding features:

cardwords_server:
* Extend end of game: assign final points, reveal opponents' cards.

cardwords_textclient:
* Write it.

server and clients:
* Build or adapt CGTP (Crossword Game Transfer Protocol).
  The Protocol clients and server use is currently not documented and is
  messy. I'm currently learning about how to write such a protocol that
  could probably lead to an rfc; but I would gladly adopt such a protocol if
  someone else writes it and it could be used for cardwords.


Cleaning source code:

* Use STL-API for Gtk-- containers: cardwords_gtk_playerlist

* Fix all FIXMEs.

* Change c-style (casts) to static_cast<>() and
  dynamic_cast<>() where appropriate.

* Change INT_MIN etc to numeric_limits<int>::min() etc when stdc++ supports
  it.