in_place_ policy is  tied to linalg
nt2/options.hpp is now automatically aggregated
Cleared out gammainc related options

Those options where actually internal only
Reworked and completed freqspace
Move tags to sdk instead of placeholders
fix typo in documentation
add 'ignore' options to gather_includes for options.hpp, just in case we ever decide to have a nt2/details directory
Merge pull request #780 from MetaScale/765_unify_options_file

Make options a gathered file