Move all post-chaintip-change notifications to ActivateBestChain
Move all post-chaintip-change notifications to ActivateBestChain

(cherry picked from commit 202e01941c087e0b06a7c18ce344a53ce94e1350)

reddcoin-project/reddcoin,reddcoin-project/reddcoin,reddcoin-project/reddcoin,reddcoin-project/reddcoin,reddcoin-project/reddcoin,reddcoin-project/reddcoin