Dmedia 12.10

Wowza, so much. Highlights:

* Adds a very simple WSGI server with SSL and IPv6 support, which is used for the new unified server (Dmedia file transfer and CouchDB proxy), and also by the challenge-response protocol for device peering

* New public-key based Machine and User identity system that uses a hash of the RSA public key as the ID; the ID is a 240-bit Skein hash, with personalization string only used in this context

* New unified WSGI app that mounts the Dmedia files app at /files/ and a new CouchDB proxy app at /couch/; CouchDB no longer accepts outside connections and we now have only this single, SSL-protected port accepting outside connections; authorized clients must have a machine certificate signed by the user CA

* Adds a challenge-response peering protocol that allow the user to easily peer additional devices; the existing device displays a 40-bit random code that they must type on the new device; SSL and the above intrinsic IDs are used to make sure the peering is happening between exactly 2 devices, and the secret code makes sure they're the correct devices (see dmedia/identity.py)

* Adds revamped first-run, onboarding experience that walks the user through the device peering; this is run automatically if needed the first time the user runs dmedia-gtk or novacut-gtk (more generic integration to be used by other apps will come later)