Move internal miner/block creation to separate miner.cpp module.

Public functions referenced elsewhere are added to miner.h.

src/main.h

@@ -159,16 +159,6 @@ bool ProcessMessages(CNode* pfrom);
 bool SendMessages(CNode* pto, bool fSendTrickle);
 /** Run an instance of the script checking thread */
 void ThreadScriptCheck();
-/** Run the miner threads */
-void GenerateBitcoins(bool fGenerate, CWallet* pwallet);
-/** Generate a new block, without valid proof-of-work */
-CBlockTemplate* CreateNewBlock(CReserveKey& reservekey);
-/** Modify the extranonce in a block */
-void IncrementExtraNonce(CBlock* pblock, CBlockIndex* pindexPrev, unsigned int& nExtraNonce);
-/** Do mining precalculation */
-void FormatHashBuffers(CBlock* pblock, char* pmidstate, char* pdata, char* phash1);
-/** Check mined block */
-bool CheckWork(CBlock* pblock, CWallet& wallet, CReserveKey& reservekey);
 /** Check whether a block hash satisfies the proof-of-work requirement specified by nBits */
 bool CheckProofOfWork(uint256 hash, unsigned int nBits);
 /** Calculate the minimum amount of work a received block needs, without knowing its direct parent */
@@ -185,6 +175,8 @@ bool GetTransaction(const uint256 &hash, CTransaction &tx, uint256 &hashBlock, b
 bool SetBestChain(CValidationState &state, CBlockIndex* pindexNew);
 /** Find the best known block, and make it the tip of the block chain */
 bool ConnectBestBlock(CValidationState &state);
+int64 GetBlockValue(int nHeight, int64 nFees);
+unsigned int GetNextWorkRequired(const CBlockIndex* pindexLast, const CBlockHeader *pblock);
 
 void UpdateTime(CBlockHeader& block, const CBlockIndex* pindexPrev);