CORE: Prevent mining of orphans on startup
CORE: Prevent mining of orphans on startup

Miners were mining orphans on startup due to being far behind the chain, improve the mining code a little to prevent this

nlgcoin/guldencoin-official,nlgcoin/guldencoin-official,nlgcoin/guldencoin-official,nlgcoin/guldencoin-official,nlgcoin/guldencoin-official,nlgcoin/guldencoin-official