Merge pull request #2778 from jgarzik/rpc-verifydb

RPC: add 'verifychain' to verify chain database at runtime

src/main.h

@@ -146,7 +146,7 @@ bool LoadBlockIndex();
 /** Unload database information */
 void UnloadBlockIndex();
 /** Verify consistency of the block and coin databases */
-bool VerifyDB();
+bool VerifyDB(int nCheckLevel, int nCheckDepth);
 /** Print the loaded block tree */
 void PrintBlockTree();
 /** Find a block by height in the currently-connected chain */