* src/boards/chess.c: (start_board), (start_child): cleanup. do not work as expected on widows yet
	* src/boards/chess_position.h: cleanup
	* src/gcompris/assetml.c: (dump_asset), (parse_doc),
	(assetml_load_xml), (assetml_get_asset): added traces
	* src/gcompris/gameutil.c: (gcompris_find_absolute_filename): cleanup
	* src/gcompris/soundutil.c: (scheduler), (thread_play_ogg),
	(gcompris_play_ogg), (gcompris_play_ogg_list): fixed memory leaks for windows. reviewed the
	whole code of this function.