[task #15676] Calculating SIP to TPV coversions

[Mohammad Akhlaghi]

Follow-up Comment #10, task #15676 (project gnuastro):

Sachin, we only need the image size for the TPV to SIP conversion, right? So
that shouldn't affect Raul's check (which is SIP TO TPV).  

Our conversion function just takes the 'wcsprm', the CD matrix is already in
it! What other keyword do you mean?

It is easy to avoid a dataset and only write a header ;-).

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