[fpc-pascal] Optimized matrix multiplication functions for pascal?

[Marco van de Voort]

In our previous episode, Sven Barth said:
> Try the unit matrix.pp which is part of FPC's RTL. It also includes 
> overloaded operators if you need them. ^^

Afaik matrix only defines 4x4 or less. 
 
Numlib also has a large number of matrix routines (including determinant,
eigen values etc), but is not entirely documented. (actually there is
documentation, but it is in dutch)