Added another checkpoint at block 15164

long blockchain
getblockhash 15164
0000012af65e1e42e8d18d6d8234ecff7a1dd7d972fc34a8a37021576f28b593
short blockchain
getblockhash 15164
￼000000e5214eba206a93d099fc1cd6f99178e806183af7749eae9601a424e9b7