Fix satdet regression test failure in dev and public about acstools HOT 7 CLOSED

These changes are good. Thanks @pllim!

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I see the test failing in the pandokia engine but can I get at the data somehow?

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I cannot reproduce this error. Could you give me more information on the environment?

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@jhunkeler or @rendinam know where to dig that out.

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@dborncamp , by the way, in the test log given above, don't worry about the traceback at the end, but rather note that fitsdiff reported differences in result, which I think is also what you see?

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Update: Dave Borncamp was unable to produce the bad output on his environment but I am able to... My bet is on some changes upstream between Astropy 1.3 and 2.0. Maybe astropy/astropy#5991 but why it did not show up until June 14 on dev (which is supposed to pick up Astropy dev), I don't know.

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There are still some differences but they appear to me as aliasing effect: https://ssb.stsci.edu/pandokia/pandokia.cgi?query=detail&key_id=105008197

@dborncamp, those files are temporarily at /eng/ssb/lim/acstools_issue29. Please have a look and see if the differences are acceptable. Thanks!

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