[Distutils] greater compression on pypi?

[Daniel Holth]

Some obvious ideas about how to enable greater compression for pypi, should
anyone be motivated enough to do so.

1. If it's a zip, nested zips like so,

setup.py
README
(metadata)
data.zip

The metadata is easy to get to, and everything else requires a second
unpack operation. data.zip is stored, and only compressed by the outer
.zip. This could be done in a backwards compatible way.

Wheel could be revised to put everything except *.dist-info inside a zipped
*.data directory.

2. Sign the uncompressed data

Check hashes and signatures against the .tar file instead of .tar.gz when
doing pip install ... #sha256=nnn. For zip, check against a hash of all the
hashes of the uncompressed members.

3. Go crazy

pypi is now free to re-compress without additional input from the
publisher. Both .gz and .lzma versions etc. could be offered.
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