Sat Jan 31 09:42:58 2009  Jiri (George) Lebl <jirka@5z.com>

	* src/mpwrap.c: it turns out the gmp cmp functions can return other
	  values than -1,0,1.  So normalize on the mpw_cmp* level.  This
	  broke for loops that started at negative numbers.

	* src/geniustests.txt: add some tests for the for loops starting at
	  negative values

	* src/graphing.c: fixup the tick size for slopefield and vectorfield
	  Implement stubs for the GEL interface to all of these, allow
	  setting the increment in SlopefieldDrawSolution

	* src/calc.h: update the COPYRIGHT_STRING


svn path=/trunk/; revision=697