Coded fix for anisotropic scattering
moved scattering model 2 to subroutine in anisowind.c
Called function in photo_gen_matom and commented randwind_thermal_trapping
Added line_mode 9, Commented more and removed unused variables
updated photo_gen_wind to be consistent with scatter mode
Remade prototypes
added correction of nnscat by p_norm
Made nnscat a ptr, commented, moved p_norm correction to trans_phot
Merge pull request #83 from jhmatthews/aniso_hotfix

Normalise the rejection method in thermal trapping anisotropic scattering