Tue Oct 08 17:28:57 2013  Jiri (George) Lebl <jirka@5z.com>

	* src/graphing.[ch], src/eval.[ch], src/genius.c, src/gnome-genius.c:
	  Improve the PlotCanvasFreeze/Thaw functions, and make sure plot
	  canvas is always thawed after end of execution so that it never
	  simply remains frozen.

	* help/C/genius.xml: Document the two functions