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19962 commits behind the upstream repository.

Christophe Geuzaine
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This is a pretty big commit. - The Numerical Recipes routines have been moved to their own subdirectory: NR/ - These routines are now completely optional. Configure will determine if they have to be compiled in (if it's a non-free version of Gmsh) or if we should use the GSL routines instead. - The GSL routines are there. Well, sort of. The SVD stuff works great, but the minimization routines still need more work. The whole infrastructure is there, though: we can already compile a fully GPL compliant version of Gmsh by removing the NR subdirectory (or by specifying --enable-gsl to configure). - I also simplified the options passed to the compiler (OPTIM and FLAGS). That's all for today folks...