--- TO DO LIST ---
[ ] Should: Add a nice screenshot of the Gtkmm front-end on the second website !
[.] Should: Hint mode : at the moment "resolve cell" is available.
[ ] Could: The Help|About dialog could show kanji and hiragana/katakana

--- Done list ---
[x] Must: Edit|Preferences
[?] fix random crash when changing language(difficult to reproduce)
[v] Could: The Help|About dialog could show a nice picture
[v] Custom grid feature
[v] Spanish translation
[v] Should: complete Game|Open feature
[v] Must: Game|Open a saved grid
[v] Should: complete Game|SaveAs feature
[v] Must: Game|SaveAs grid
[v] Must: allow navigation in the grid using the four keyboard arrows (left, right, up, down).
[v] Esperanto translation
[v] French translation
[v] Japanese translation
[v] Must: remove obsolete_guis directory from release archives!
[v] Must: Game|New grid
[v] Must: Edit|Undo move
[v] Must: Edit|Clear all moves
[v] Could: Export the generated grid to HTML
[v] Should: Grid printing - thanks to your Web browser (HTML feature)
[v] Should: Support for l10n
[v] Must: Faster grid solver
[v] Must: Simpler code...
[v] Must: For the BETA version only(I changed my mind about this and did it for alpha 0.1.0): 
    add the application a nice program icon.
[obsolete] fix "duplicate values in grid" bug where by pressing very quickly 
    on the 1,2...9 keys and on the TAB (or SHIFT-TAB) key on the keyboard
    I have been able to enter two identical values in the same 3x3 square !
    in case the bug can be reproduced, of course...

[v] Traces should not be there as a default: they affect performance a lot!
[~] Must: ./configure, etc. Ensure the user can disable the front-ends he doesn't want to use:
    disabled the xfc front-end by default. Gtkmm is the default.
[v] Should: temporarily avoid the xfc front-end to be generated by default.
            By default, the gtkmm and txt front-ends are generated.
[v] Must: Grid generator, but only at application startup for the moment
[v] Should: Gtkmm front-end: show menu hints in the status bar
[v] Must: Gtkmm front-end: avoid crash when trying to solve a grid that's already complete
[v] Must: make Game|Quit menu and button to work
[v] Must: Help|About should open a nice information dialog with version and status (pre-Alpha, Alpha, ...)
[v] Must: Gtkmm front-end: Game|Solve grid
[v] Should:Gtkmm front-end: show button tooltips
[v] Basic Gtkmm front-end (not yet usable to play)
[v] Operational Gtkmm front-end (not yet very much usable to play in version 0.0.6_gtkmm)
[v] Xfc front-end: Capability to solve the grid from the Xfc gui
