Tue Sep 16 16:30:42 2014  Jiri (George) Lebl <jirka@5z.com>

	* src/graphing.c:  Fitting dependent axis doesn't work if no
	  function is selected, so just ignore fitting when size is negative
	  rather than doing undefined things.  The whole thing is a mess,
	  we should allow fitting the lines that we draw and such I guess
	  not just functions.