* Makefile.mingw.in: removed deprecated assetml files
	* boards/flags/Makefile.am: cleanup
	* boards/flags/README: updated image source
	* boards/gcompris_pixmaps.assetml.in: removed, no more needed
	* src/boards/chess.c: (chess_create_item): fixed leak
	* src/boards/machpuzzle.c: (minigolf_destroy_all_items): fixed leak
	* src/boards/maze.c: (twoDdisplay): fixed leak
	* src/boards/menu2.c: (create_top): fixed leak
	* src/boards/python/electric.py: added windows support
	* src/boards/shapegame.c: (destroy_shape), (xmlGetProp_Double),
	(add_xml_shape_to_data): fixed leak
	* src/gcompris/bar.c: (gc_bar_start): no more show button by default
	* src/gcompris/config.c: (gc_config_start), (item_event_ok): fixed leak
	* src/gcompris/dialog.c: (gc_dialog): accept a dialog without a board running
	  this is usefull to display dialog at statup when we don't find a board at all
	* src/gcompris/gameutil.c: (gc_file_find_absolute): fixed leak
	* src/gcompris/gcompris.c: (gc_cursor_set), (setup_window),
	(cleanup), (load_properties), (gc_init): memory leak, display a dialog now when
	no board are found
	* src/gcompris/menu.c: (_add_xml_to_data): fixed leak
	* src/gcompris/properties.c: (gc_prop_new): fixed leak
	* src/gcompris/skin.c: (gc_skin_free): fixed leak