gsl matrix

[Brian Gough]

J.J. Gomez Cadenas writes:
 > As suspected that cure of the problem was easy enough. Simply adding an
 > empty constructor within a #ifdef __cpluplus will do it.
 > I have know a version with this patch added to all the relevant header files
 > (there are quite a few!!!). I'd be pleased, of course, to send it to you, or
 > to committ it to the repository, or whatever. Please tell me what you
 > prefer.

Ok, if you send the patches to me I will add them.