Dic_lookup takes a string containing real chars, not codes.
The idea is to hide the internal representation of the characters from the
users of the dictionary, who don't care about it.
This simplifies the code in many places, and allows inheritance of the
game mode classes (Training, Duplicate and FreeGame).
- A Tile is no more an unsigned char, but a class: it should help supporting
i18n of the game. The Dic library still uses unsigned chars though.
- Improved the configure script, to enable/disable the compilation of some
interfaces.
- Added a ncurses interface, much nicer than the text one. The game mode and
the number of players are currently hardcoded, it is not possible to change
them interactively (yet).
- Repaired the save/load functions.
NOTE: The wxWindows interface compiles, but is completely broken. I'm afraid it
needs a full rewrite (to support the various game modes in particular).
