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Adds an interface to the computed UVW coordinates, and tests the CALC uvw coordinates against a similar calculation in astropy.
This also adds a way to set various debugging flags in CALC, which will cause certain modules to print debug information. This isn't very user-friendly, but can be useful in development. As a future task, we should think about ways to clean up debug information on the fortran side and support multiple levels of verbosity.
While working on this, I found that the atmosphere module is still used for some things even if the Add-dry / Add-wet options are disabled. Certain uvw calculation modes include troposphere refraction. This should be documented further. There are special flags to control which modules get used, which may be useful for better controlling these things.