cli: Add "headers" and "verificationprogress" to -getinfo
cli: Add "headers" and "verificationprogress" to -getinfo

These value are useful to know the current progress of
initial sync, or of catching up.

AkioNak/bitcoin,kallewoof/bitcoin,qtumproject/qtum,sstone/bitcoin,n1bor/bitcoin,jnewbery/bitcoin,practicalswift/bitcoin,fanquake/bitcoin,DigitalPandacoin/pandacoin,alecalve/bitcoin,mm-s/bitcoin,mm-s/bitcoin,pataquets/namecoin-core,litecoin-project/litecoin,domob1812/bitcoin,namecoin/namecore,practicalswift/bitcoin,midnightmagic/bitcoin,cdecker/bitcoin,apoelstra/bitcoin,rnicoll/bitcoin,andreaskern/bitcoin,peercoin/peercoin,Xekyo/bitcoin,rnicoll/bitcoin,cdecker/bitcoin,andreaskern/bitcoin,ahmedbodi/vertcoin,rnicoll/bitcoin,yenliangl/bitcoin,prusnak/bitcoin,mitchellcash/bitcoin,fujicoin/fujicoin,GroestlCoin/GroestlCoin,lateminer/bitcoin,namecoin/namecoin-core,jlopp/statoshi,pataquets/namecoin-core,qtumproject/qtum,gjhiggins/vcoincore,tecnovert/particl-core,namecoin/namecoin-core,pataquets/namecoin-core,tjps/bitcoin,pstratem/bitcoin,fanquake/bitcoin,bitcoinsSG/bitcoin,ajtowns/bitcoin,andreaskern/bitcoin,mm-s/bitcoin,tecnovert/particl-core,achow101/bitcoin,jambolo/bitcoin,rnicoll/dogecoin,JeremyRubin/bitcoin,jonasschnelli/bitcoin,peercoin/peercoin,namecoin/namecoin-core,GroestlCoin/GroestlCoin,EthanHeilman/bitcoin,jlopp/statoshi,fujicoin/fujicoin,bitcoinsSG/bitcoin,tecnovert/particl-core,mruddy/bitcoin,ahmedbodi/vertcoin,EthanHeilman/bitcoin,JeremyRubin/bitcoin,pstratem/bitcoin,anditto/bitcoin,Xekyo/bitcoin,MeshCollider/bitcoin,AkioNak/bitcoin,AkioNak/bitcoin,bitcoinsSG/bitcoin,domob1812/namecore,fujicoin/fujicoin,JeremyRubin/bitcoin,particl/particl-core,GroestlCoin/GroestlCoin,MeshCollider/bitcoin,kallewoof/bitcoin,AkioNak/bitcoin,ElementsProject/elements,yenliangl/bitcoin,vertcoin/vertcoin,Sjors/bitcoin,GroestlCoin/GroestlCoin,domob1812/namecore,ajtowns/bitcoin,midnightmagic/bitcoin,rnicoll/dogecoin,bitcoin/bitcoin,rnicoll/bitcoin,apoelstra/bitcoin,gjhiggins/vcoincore,AkioNak/bitcoin,apoelstra/bitcoin,alecalve/bitcoin,gjhiggins/vcoincore,jonasschnelli/bitcoin,jnewbery/bitcoin,litecoin-project/litecoin,mitchellcash/bitcoin,lateminer/bitcoin,prusnak/bitcoin,sipsorcery/bitcoin,Xekyo/bitcoin,mruddy/bitcoin,GroestlCoin/bitcoin,alecalve/bitcoin,achow101/bitcoin,ElementsProject/elements,sipsorcery/bitcoin,jambolo/bitcoin,domob1812/namecore,domob1812/namecore,midnightmagic/bitcoin,vertcoin/vertcoin,DigitalPandacoin/pandacoin,Xekyo/bitcoin,jambolo/bitcoin,n1bor/bitcoin,mm-s/bitcoin,MarcoFalke/bitcoin,tjps/bitcoin,ahmedbodi/vertcoin,mm-s/bitcoin,namecoin/namecoin-core,particl/particl-core,namecoin/namecore,bitcoinknots/bitcoin,prusnak/bitcoin,tjps/bitcoin,namecoin/namecore,namecoin/namecore,prusnak/bitcoin,tjps/bitcoin,ElementsProject/elements,sipsorcery/bitcoin,gjhiggins/vcoincore,sipsorcery/bitcoin,namecoin/namecoin-core,Xekyo/bitcoin,andreaskern/bitcoin,sstone/bitcoin,apoelstra/bitcoin,monacoinproject/monacoin,lateminer/bitcoin,n1bor/bitcoin,dscotese/bitcoin,apoelstra/bitcoin,anditto/bitcoin,particl/particl-core,JeremyRubin/bitcoin,litecoin-project/litecoin,EthanHeilman/bitcoin,ajtowns/bitcoin,mitchellcash/bitcoin,dscotese/bitcoin,jamesob/bitcoin,apoelstra/bitcoin,anditto/bitcoin,EthanHeilman/bitcoin,qtumproject/qtum,jnewbery/bitcoin,bitcoinknots/bitcoin,andreaskern/bitcoin,Xekyo/bitcoin,yenliangl/bitcoin,jambolo/bitcoin,bitcoin/bitcoin,GroestlCoin/bitcoin,ahmedbodi/vertcoin,mruddy/bitcoin,namecoin/namecoin-core,GroestlCoin/GroestlCoin,fujicoin/fujicoin,yenliangl/bitcoin,qtumproject/qtum,Sjors/bitcoin,n1bor/bitcoin,particl/particl-core,MarcoFalke/bitcoin,GroestlCoin/GroestlCoin,peercoin/peercoin,n1bor/bitcoin,rnicoll/dogecoin,sstone/bitcoin,pataquets/namecoin-core,rnicoll/bitcoin,fujicoin/fujicoin,sstone/bitcoin,dscotese/bitcoin,alecalve/bitcoin,kallewoof/bitcoin,rnicoll/dogecoin,litecoin-project/litecoin,jamesob/bitcoin,EthanHeilman/bitcoin,litecoin-project/litecoin,instagibbs/bitcoin,yenliangl/bitcoin,monacoinproject/monacoin,DigitalPandacoin/pandacoin,pataquets/namecoin-core,MeshCollider/bitcoin,bitcoin/bitcoin,cdecker/bitcoin,cdecker/bitcoin,instagibbs/bitcoin,jamesob/bitcoin,jonasschnelli/bitcoin,cdecker/bitcoin,qtumproject/qtum,jamesob/bitcoin,sstone/bitcoin,sipsorcery/bitcoin,bitcoinsSG/bitcoin,jnewbery/bitcoin,tecnovert/particl-core,tjps/bitcoin,tjps/bitcoin,Sjors/bitcoin,GroestlCoin/bitcoin,qtumproject/qtum,mruddy/bitcoin,qtumproject/qtum,ajtowns/bitcoin,vertcoin/vertcoin,achow101/bitcoin,mitchellcash/bitcoin,jambolo/bitcoin,domob1812/bitcoin,GroestlCoin/bitcoin,ElementsProject/elements,sstone/bitcoin,pstratem/bitcoin,mm-s/bitcoin,achow101/bitcoin,rnicoll/dogecoin,monacoinproject/monacoin,alecalve/bitcoin,ahmedbodi/vertcoin,kallewoof/bitcoin,vertcoin/vertcoin,n1bor/bitcoin,MarcoFalke/bitcoin,jlopp/statoshi,ajtowns/bitcoin,ahmedbodi/vertcoin,litecoin-project/litecoin,lateminer/bitcoin,jnewbery/bitcoin,practicalswift/bitcoin,rnicoll/bitcoin,jonasschnelli/bitcoin,bitcoinknots/bitcoin,prusnak/bitcoin,peercoin/peercoin,practicalswift/bitcoin,achow101/bitcoin,fanquake/bitcoin,MeshCollider/bitcoin,monacoinproject/monacoin,instagibbs/bitcoin,bitcoin/bitcoin,ElementsProject/elements,anditto/bitcoin,domob1812/namecore,dscotese/bitcoin,practicalswift/bitcoin,jlopp/statoshi,dscotese/bitcoin,vertcoin/vertcoin,anditto/bitcoin,mitchellcash/bitcoin,JeremyRubin/bitcoin,alecalve/bitcoin,GroestlCoin/bitcoin,ajtowns/bitcoin,MeshCollider/bitcoin,domob1812/bitcoin,bitcoin/bitcoin,DigitalPandacoin/pandacoin,GroestlCoin/bitcoin,namecoin/namecore,instagibbs/bitcoin,prusnak/bitcoin,yenliangl/bitcoin,jlopp/statoshi,MarcoFalke/bitcoin,kallewoof/bitcoin,jlopp/statoshi,domob1812/bitcoin,pstratem/bitcoin,bitcoinknots/bitcoin,instagibbs/bitcoin,mitchellcash/bitcoin,jamesob/bitcoin,mruddy/bitcoin,lateminer/bitcoin,midnightmagic/bitcoin,fujicoin/fujicoin,EthanHeilman/bitcoin,anditto/bitcoin,andreaskern/bitcoin,jonasschnelli/bitcoin,mruddy/bitcoin,pstratem/bitcoin,ElementsProject/elements,midnightmagic/bitcoin,sipsorcery/bitcoin,dscotese/bitcoin,MarcoFalke/bitcoin,bitcoinknots/bitcoin,vertcoin/vertcoin,DigitalPandacoin/pandacoin,pstratem/bitcoin,instagibbs/bitcoin,gjhiggins/vcoincore,particl/particl-core,lateminer/bitcoin,practicalswift/bitcoin,domob1812/bitcoin,monacoinproject/monacoin,achow101/bitcoin,peercoin/peercoin,cdecker/bitcoin,domob1812/namecore,bitcoin/bitcoin,pataquets/namecoin-core,monacoinproject/monacoin,particl/particl-core,MarcoFalke/bitcoin,jamesob/bitcoin,bitcoinsSG/bitcoin,fanquake/bitcoin,Sjors/bitcoin,domob1812/bitcoin,tecnovert/particl-core,JeremyRubin/bitcoin,MeshCollider/bitcoin,DigitalPandacoin/pandacoin,midnightmagic/bitcoin,fanquake/bitcoin,namecoin/namecore,bitcoinsSG/bitcoin,peercoin/peercoin,gjhiggins/vcoincore,jambolo/bitcoin,kallewoof/bitcoin,AkioNak/bitcoin,tecnovert/particl-core,fanquake/bitcoin,Sjors/bitcoin