clarify function signature (GetNumBlocksOfPeers) and use number of 'frozen' blocks as initial value for number of peer blocks

src/main.h

@@ -99,7 +99,7 @@ void FormatHashBuffers(CBlock* pblock, char* pmidstate, char* pdata, char* phash
 bool CheckWork(CBlock* pblock, CWallet& wallet, CReserveKey& reservekey);
 bool CheckProofOfWork(uint256 hash, unsigned int nBits);
 int GetTotalBlocksEstimate();
-int GetMaxBlocksOfOtherNodes();
+int GetNumBlocksOfPeers();
 bool IsInitialBlockDownload();
 std::string GetWarnings(std::string strFor);