Add helper function for checking header continuity
Add helper function for checking header continuity

instagibbs/bitcoin,mruddy/bitcoin,namecoin/namecoin-core,jamesob/bitcoin,fujicoin/fujicoin,lateminer/bitcoin,sstone/bitcoin,fanquake/bitcoin,bitcoinsSG/bitcoin,namecoin/namecore,instagibbs/bitcoin,AkioNak/bitcoin,kallewoof/bitcoin,namecoin/namecoin-core,ajtowns/bitcoin,tecnovert/particl-core,sipsorcery/bitcoin,particl/particl-core,AkioNak/bitcoin,lateminer/bitcoin,tecnovert/particl-core,sstone/bitcoin,tecnovert/particl-core,kallewoof/bitcoin,namecoin/namecore,namecoin/namecore,domob1812/bitcoin,fujicoin/fujicoin,lateminer/bitcoin,ajtowns/bitcoin,mruddy/bitcoin,ajtowns/bitcoin,ajtowns/bitcoin,fujicoin/fujicoin,bitcoin/bitcoin,fanquake/bitcoin,jamesob/bitcoin,AkioNak/bitcoin,Xekyo/bitcoin,sipsorcery/bitcoin,fanquake/bitcoin,mruddy/bitcoin,namecoin/namecore,fanquake/bitcoin,jamesob/bitcoin,instagibbs/bitcoin,jambolo/bitcoin,namecoin/namecoin-core,tecnovert/particl-core,domob1812/bitcoin,fujicoin/fujicoin,kallewoof/bitcoin,bitcoin/bitcoin,namecoin/namecoin-core,sipsorcery/bitcoin,Xekyo/bitcoin,Xekyo/bitcoin,sstone/bitcoin,domob1812/bitcoin,Xekyo/bitcoin,fujicoin/fujicoin,ajtowns/bitcoin,ajtowns/bitcoin,bitcoinsSG/bitcoin,particl/particl-core,kallewoof/bitcoin,jambolo/bitcoin,particl/particl-core,AkioNak/bitcoin,lateminer/bitcoin,instagibbs/bitcoin,sipsorcery/bitcoin,sipsorcery/bitcoin,namecoin/namecoin-core,bitcoin/bitcoin,Xekyo/bitcoin,mruddy/bitcoin,jamesob/bitcoin,jambolo/bitcoin,namecoin/namecore,fanquake/bitcoin,sstone/bitcoin,particl/particl-core,Xekyo/bitcoin,mruddy/bitcoin,jambolo/bitcoin,tecnovert/particl-core,AkioNak/bitcoin,kallewoof/bitcoin,instagibbs/bitcoin,bitcoinsSG/bitcoin,bitcoin/bitcoin,particl/particl-core,bitcoinsSG/bitcoin,domob1812/bitcoin,bitcoin/bitcoin,tecnovert/particl-core,fanquake/bitcoin,bitcoinsSG/bitcoin,sipsorcery/bitcoin,sstone/bitcoin,namecoin/namecoin-core,lateminer/bitcoin,jamesob/bitcoin,sstone/bitcoin,domob1812/bitcoin,jamesob/bitcoin,namecoin/namecore,domob1812/bitcoin,jambolo/bitcoin,bitcoin/bitcoin,bitcoinsSG/bitcoin,jambolo/bitcoin,particl/particl-core,instagibbs/bitcoin,lateminer/bitcoin,kallewoof/bitcoin,mruddy/bitcoin,fujicoin/fujicoin,AkioNak/bitcoin