Sun Feb 01 00:11:32 2009  Jiri (George) Lebl <jirka@5z.com>

	* src/graphing.c: do Runge-Kutta instead of Euler for the graphical
	  slopefield solver.  Whack VectorfieldCPlot (never implemented,
	  should not be a separate function anyway).  Implement
	  VectorfieldPlot and SlopefieldPlot.

	* help/C/genius.xml, help/C/gel-function-list.xml: update for all
	  the new changes


svn path=/trunk/; revision=699