[Kalzium] Proposal : use GSL/GSL-- for the linear algebra stuff

[Benoît Jacob]

> I think it's a great idea and I'd be open to "convenience" functions
> for math routines on top of another library. I suspect this is a
> better effort after 2.1 is released this fall and could be part of a
> 3.0 effort. (I'd certainly push for more use of Boost and other core
> libraries in Open Babel 3.0 development.)
>

no problem at all : with my plan, Kalzium will not directly rely anymore on 
OpenBabel's math (vector3 and matrix3x3) classes, so, from the point of view 
of Kalzium, there is not urge to apply this modification to OpenBabel!

Benoit