[Catalog-sig] PyPI: new browse code

[Richard Jones]

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I've just revamped the (flamenco-based) browsing code in PyPI - it's much=20
faster now and gives slightly better results (sub-category counts are=20
accurate and categories list matches for their sub-categories).

In a nutshell, it does a single SQL fetch now and mangles the results in=20
Python code. This means the database is open for much less time, and the=20
program generates the result faster too.

Hopefully this change, in addition to serving the RSS feed from a cache wil=
l=20
alleviate the locking issues for now.


   Richard

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