Remove NumBlocksOfPeers

Generally useless information. Only updates on connect time, not after
that. Peers can easily lie and the median filter is not effective in
preventing that.

In the past it was used for progress display in the GUI but
`CheckPoints::guessVerificationProgress` provides a better way that is now used.
It was too easy to mislead it. Peers do lie about it in practice, see issue #4065.

From the RPC, `getpeerinfo` gives the peer raw values, which are more
useful.

src/main.h

@@ -160,8 +160,6 @@ void ThreadScriptCheck();
 bool CheckProofOfWork(uint256 hash, unsigned int nBits);
 /** Calculate the minimum amount of work a received block needs, without knowing its direct parent */
 unsigned int ComputeMinWork(unsigned int nBase, int64_t nTime);
-/** Get the number of active peers */
-int GetNumBlocksOfPeers();
 /** Check whether we are doing an initial block download (synchronizing from disk or network) */
 bool IsInitialBlockDownload();
 /** Format a string that describes several potential problems detected by the core */