Basic version of a function optimizer.
	- As is just extends Goal Seek to scalar functions working on
	  N dimensional space.
	- Adjustable aborting criteria: precision, max. iterations.
	- Usable for non-linear functions (simplex algo).
	- Uses the GNU Scientific Library. If it's not present the plugin won't
	  be compiled.

CCBUG:	126630

svn path=/trunk/koffice/; revision=542194