[ARCH] Added gem skeleton
[data] Added Data:Date (ln_date)
[data] Added Data::DMS (ln_dms)
[data] Added Data::EllOrbit (ln_ell_orbit)
[data] Added Data::EquPosn (ln_equ_posn)
[data] Added Data::GalPosn (ln_gal_posn)
[data] Added Data::HelioPosn (ln_helio_posn)
[data] Added Data::HMS (ln_hms)
[data] Added Data::HrzPosn (ln_hrz_posn)
[data] Added Data::HypOrbit (ln_hyp_orbit)
[data] Added Data::LnLatPosn (ln_lnlat_posn)
[data] Added Data::Nutation (ln_nutation)