Use CFFI-grovel to define enumerations and programming constants
Instead of hardwiring GSL's #define or enum values, define them in init/libgsl-unix.lisp and run CFFI-grovel on them. This has the advantage that if these values change in GSL, GSLL will automatically get the new values; also, there was an error in the 'integrate-method enum due to an incorrect starting value. It has the disadvantage that building GSLL now requires a C compiler and some of the header (.h) files for GSL. Also, it's not clear what the form for libgsl-*.lisp files are for non-unix OSes.
Showing with 162 additions and 87 deletions