first attempt at building AHOT

This builds everything from `fortran/spatial_solvers_3d/source/*.f90` that isn't main.90 into a shared object that you can link against with `-lahot`.  I would recommend that you move all of the python stuff (including f2py) into a `pyne/ahot` directory or similar and make AHOT and related tools its own PyNE subpackage.  YOu may also want to re-arrange the directory structure inside of `fortran/` to be more flat in light of this.  This should get you started though. Please do not hesitate to ask questions!  I know how confusing build systems can be, especially when mixing languages.