Software: CFITSIO 3.47, implemented many common standards

Until now, CFITSIO had several peculiar features which needed special
attention: 1) Its tarball didn't have a `.' in the version name and would
sometimes have extra `0's. 2) When unpacked it was just `cfitsio'. 3) It
hard coded the directory to search for cURL library. All of these forced us
to do a lot of extra steps for CFITSIO.

So I got in touch with them and fortunately they were very open to
correcting these issues and with version 3.47 all such issues have been
addressed in the tarball. Thanks to these changes, with this commit,
CFITSIO's build rule is now very similar to many other programs.

I also noticed that it has an optional `--with-bz2' feature to enable
unpacking `.fits.bz2' files. So this feature is also added.

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