[Core] Add DGW
[RPC] Add 'getnetworkhashps'
[Core] Change protocol version: 90001
Remove multiple algorithm functions
Remove weighting
Add global block fork variable (NFORKONE)
Strict block versioning
Strict versioning control
NFORKONE block to 42778
Checkpoint at block 41050
Merge pull request #7 from io-eightyeight/1.2.0.0

1.2.0.0