Solo mining using getwork

Initial implementation for solo mining using getwork protocol. It works
only with a fix to the primecoin client:
https://github.com/hg5fm/primecoin/commit/c34f5f90c11a360bbe0731f06b19f256d4ce7765
Manual merge of the optimized  sieve code from rdebourbon's miner v3.3
Merge branch 'master' of https://github.com/hg5fm/jhPrimeminer

Conflicts:
	src/primecoinMiner/main.cpp
Missing file for solo mining