Consider using gproc for configuration

[jlouis]

Consider using the gproc's new configuration registry rather than your own baking.

[edwardw]

The document on this is sparse. Do you refer to this change?
esl/gproc@59365c4

And it seems official gproc repository is now esl/gproc, not uwiger/gproc, isn't it?

[jlouis]

It refers to the following commit: esl/gproc@c306076df2c16 - In which Ulf added support for what we essentially have in etorrent_config. It would be better to just merge the effort and push the code out of our project and into gproc, which is what this issue is about. I just quickly created this issue to be sure I did not forget it later.

You are right that we should be using esl/gproc over uwiger/gproc as it is the official repo.