P2Pool release 9.0 - Upgrade required - Switch will result in decreased invalid blocks and Stratum support

[Forrest Voight]

P2Pool release 9.0 tag: 9.0 hash: 2cb4d8381e179f71ea2075cdce948ea83cf0dc55

HARDFORK: Upgrade is required! Hardfork will happen after 95% of the
pool's hash rate has upgraded. Everybody having not upgraded will be
split off into a tiny P2Pool.

Windows binary: http://u.forre.st/u/urxoztyg/p2pool_win32_9.0.zip
Source zipball: https://github.com/forrestv/p2pool/zipball/9.0
Source tarball: https://github.com/forrestv/p2pool/tarball/9.0

Changes:
* Transaction preforwarding Transactions that you're mining are sent
to peers before you get a share, so any block solution you find can be
broadcast virtually instantaneously. This could theoretically get our
invalid block rate below any other pool's thanks to our large network
of nodes. This was implemented in v8, but was prevented from taking
effect due to a bug being discovered.
* Stratum support in the P2Pool protocol. Stratum mining will be
enabled in a future patch to v9.