Add RT17 test data files

c.rt17  = RT17 compact format
ce.rt17 = RT17 compact format with enhanced option (has L2 DOPPLER)
e.rt17  = RT17 expanded format
ee.rt17 = RT17 expanded format with enhanced option (has L2 DOPPLER)

All of the above also contain GPS ephemerides and ION / UTC data.
Revert "Add RT17 test data files"

This reverts commit 5d6d46d0954463a32d8d56cc63540c1b19f38b4d.