implemented importing the C20 time series 'TN-07','TN-11','CSR-RL06','TN-14','GSFC' and 'GSFC-7DAY', previously implemented in slr.graceC20.
implemented importing the C20 time series 'TN-07','TN-11','CSR-RL06','TN-14','GSFC' and 'GSFC-7DAY', previously implemented in slr.graceC20.

jgte/orb,jgte/orb,jgte/orb,jgte/orb,jgte/orb