support mock QA with fitsio>1.0 (bytes vs. str)

[sbailey]

This PR fixes #632 so that mock QA works with fitsio > 1.0 by adding extra bytes vs. str checks. It adds some trimmed down mock targets+truth test data and uses that to test mock QA. I have tested with with both fitsio/0.9.11 and fitsio/1.1.2 .

As a cleanup measure, this PR also wraps all test/make_test*.py code in if __name__ == "__main__": blocks so that importing the code (e.g. by some documentation scraper) doesn't accidentally trigger trying to regenerate the test datasets.

[geordie666]

This looks good to me...I can run all of the relevant code at NERSC without triggering any failures.

There may be cases for the mock QA in general that I'm not the best person to review. But, I independently tested passing bytes and unicode strings through QA for various parameters in the lightweight mocks files and everything passed.

[geordie666]

I'll merge this tomorrow morning if you don't beat me to it.

[sbailey]

Thanks for the additional checks. Merging now.

FWIW, the code previously passed unit tests, and now I'm going through the integration test and for anything that is failing there, I'm going back and making sure that there is a unit test that would have caught the problem. I think I am done with desitarget, but am now working on other repos.