Give config.py template a ".jinja" extension so package installation doesn't freak out trying to byte-compile it.

This knocks out one reason the continuous-deployment script is mailing me.
Quash warning about missing *.so files from the continuous deployment script by blacklisting rather than whitelisting in the manifest.

We don't need the clang plugin's shared lib on the webhead.

Start including the docs folder and C source files with the sdist.

Oddly, I can't seem to persuade either recursive-exclude or global-exclude to exclude all hidden files, no matter how I fiddle, so I've had to enumerate them.