TRC hardfork @block 192239 / v0.8.0.2 (80002)

 - TRC build 0.8.0.2 (80002) is now the min_required build. p2pool won't
   start with an older TRC build.
 - TRC network IDENTIFIER & PREFIX values changed, so older nodes won't
   interfere anymore.
send p2p version 70002

send p2p version 70002 to work properly on new LTC daemon
Merge pull request #136 from Rav3nPL/patch-1

send p2p version to 70002 to prevent litecoind from refusing connection due to too-old version
Merge pull request #133 from terracoin/trc_hardfork_80002

TRC hardfork @block 192239 / v0.8.0.2 (80002)
added nonce to bitcoin p2p ping/pong messages to fix errors in bitcoind.log
lower maximum shares per node from 5% to 1.67% (from minimum of 10 minutes per share to 30 minutes)