Name: dark_long - writes the description of the dark room

Syntax:
	int dark_long()

Description:
	This function is called when the light level in a room is 0 and the
	room is entered or a player issues the "look" command.
	
	If the function returns 0 (or does not exist) the default text is
	written, "You walk into darkness." or "It is too dark."
	
	Implementing this function allows you to write an alternative text.