* boards/sounds/en/misc/check_answer.ogg: taken from en/finland.ogg. We need to rerecord
	  finland. Susan, Jim where are you.
	* boards/sounds/en/misc/gcompris_misc_en.assetml.in:
	* src/boards/gtans.c: (taninitstart): Fixed a random crash / non functional
	on many distrib.
	* src/boards/gtans.h: cleanup
	* src/boards/python/electric.py: included a patch from Christian Gagneraud to better handle the rheostat. Created 3 difficulty levels.