custom blocks ?
- complex and double matrices & vectors with a type param ?
- finish special functions
- remaining modules
- polymorphic variants for FFT ?
- complex matrices
- BLAS functions
- put .mli only modules back
- complex funs in linalg and eigen
- complex funs for vectmat sum types
- rewrite siman in ML
- drop gsl_fun type : use closures directly
- check the "noalloc" directives in externals (removed most of them)