Fri Feb 22 01:38:54 2008  Jiri (George) Lebl <jirka@5z.com>

	* src/mpwrap.[ch]: add mpw_re_sgn and mpw_im_sgn functions and fix
	  memory leak in mpw_re and mpw_im

	* src/funclib.c: Implement QuadraticFormula internally, marginally
	  improving performance, but mainly handle special cases better
	  and avoid instability in solutions (avoid bad cancellation in most
	  cases)

	* lib/equation_solving/formulas.gel: remove QuadraticFormula from
	  here

	* src/longtest.gel: add tests for quadratic formula


svn path=/trunk/; revision=642