184 change the doppler convention #185
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This adds methods:
set_frame - change the sky coordinate reference frame in place
set_convention - change the doppler velocity convention in place
with_frame - return a new spectrum with the updated coordinate reference frame
with_velocity_convention - return a new spectrum with the updated doppler velocity convention.
It also enables "topo" as a frame in set_frame and in tests/test_doppler_frames.py
Also adds more gbtidl ascii test files to testdata/gbtidl. These are zipped because of file size limits.
Also some code cleanup.