1999-04-08  Jukka-Pekka Iivonen  <iivonen@iki.fi>

	* src/dialog-solver.c, src/dialog-goal-seek.c, src/solver.h:
	Wrote dialogs for these tools. The tools are not implemented yet.

	* src/solver-lp.c:
	New file for linear programming methods created.

	* src/sheet.h:
	Added parameters for the Solver tool.

	* src/fn-stat.c (gnumeric_correl):
	Bug fixed.  If the covariance is zero the correlation coefficient
	should also be zero. Thanks for Vladimir for pointing this one out.