Sparse matrix solver libraries

[Trass3r]

> I agree that a D implementation would be cool, but perhaps I'll just  
> bite the bullet and try to convert headers for an existing library.  
> Never done that before...

It's not that hard to convert C headers.
Just put an extern(C): at the top of the module, run some regex's to  
convert common patterns and do the rest manually.
Guess the most work is converting preprocessor stuff.