Add script to update a repository's APSW names

[dspinellis]

Update a Git repository's function names to follow the PEP 8 compliant scheme introduced in APSW version 3.42.2.

[rogerbinns]

Thanks for this. However I won't be merging it, as I don't accept third party code.

It also requires requires installing a (neat!) third party tool, and is susceptible to false positives. The latter is why I never provided an equivalent - with Python you require a deeper analysis to know that pagecount is the APSW one and not someone else's.