Make titles of the docstrings more useful (plus cleanup) #47
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The discussion in liberfa/erfa#24 made me realize that the current docstrings for the python functions are less than helpful, having as title just "Wrapper for ...", which tells one very little. So, I changed the generator such that it uses the first sentence of the description instead. The summary in particular is more descriptive (see below).
As I was a bit irritated in seeing red wiggles while editing various files, I also made everything PEP8 compliant (with slightly longer lines). Finally, in the C code a few mentions of astropy were still present, so I took the opportunity to change those. Those may make review a bit more messy; it may make most sense to look by commit...