boards/boardicons/watercycle.png: added shadow
src/boards/clickgame.c: (clickgame_next_level), (game_won): Patch by PUYDT Julien
<julien.puydt@laposte.net>. The counter now starts at 0 and 10 fishes must be hit.
src/boards/python/watercycle.py: increased timer : minor change
src/gcompris/oggplayer.c: added -1 return value when it fails to play
src/gcompris/soundutil.c: in background music, stop the thread if music fails to play