rpc: document RPC_TRANSACTION_ALREADY_IN_CHAIN exception
rpc: document RPC_TRANSACTION_ALREADY_IN_CHAIN exception

It is not documented that if you attempt to send a transaction
which already exists in a block, an RPC_TRANSACTION_ALREADY_IN_CHAIN
exception will be raised. This should be documented so that developers
are aware that this exception is raised.

sipsorcery/bitcoin,namecoin/namecore,sstone/bitcoin,apoelstra/bitcoin,rnicoll/bitcoin,ElementsProject/elements,GroestlCoin/bitcoin,lateminer/bitcoin,tecnovert/particl-core,kallewoof/bitcoin,ElementsProject/elements,achow101/bitcoin,tecnovert/particl-core,Sjors/bitcoin,MeshCollider/bitcoin,particl/particl-core,JeremyRubin/bitcoin,domob1812/namecore,pstratem/bitcoin,tecnovert/particl-core,bitcoin/bitcoin,mm-s/bitcoin,bitcoinsSG/bitcoin,bitcoinknots/bitcoin,fujicoin/fujicoin,bitcoin/bitcoin,fujicoin/fujicoin,domob1812/namecore,andreaskern/bitcoin,bitcoin/bitcoin,instagibbs/bitcoin,practicalswift/bitcoin,GroestlCoin/GroestlCoin,mruddy/bitcoin,tecnovert/particl-core,pataquets/namecoin-core,instagibbs/bitcoin,n1bor/bitcoin,bitcoinknots/bitcoin,qtumproject/qtum,qtumproject/qtum,jamesob/bitcoin,Xekyo/bitcoin,pataquets/namecoin-core,namecoin/namecore,pataquets/namecoin-core,bitcoinknots/bitcoin,qtumproject/qtum,rnicoll/bitcoin,prusnak/bitcoin,MarcoFalke/bitcoin,GroestlCoin/bitcoin,MarcoFalke/bitcoin,sstone/bitcoin,jamesob/bitcoin,pataquets/namecoin-core,MarcoFalke/bitcoin,rnicoll/bitcoin,anditto/bitcoin,bitcoinsSG/bitcoin,kallewoof/bitcoin,pstratem/bitcoin,AkioNak/bitcoin,particl/particl-core,anditto/bitcoin,mm-s/bitcoin,pataquets/namecoin-core,domob1812/bitcoin,achow101/bitcoin,ajtowns/bitcoin,jlopp/statoshi,Xekyo/bitcoin,qtumproject/qtum,kallewoof/bitcoin,fanquake/bitcoin,namecoin/namecoin-core,GroestlCoin/bitcoin,dscotese/bitcoin,sipsorcery/bitcoin,MarcoFalke/bitcoin,sstone/bitcoin,jamesob/bitcoin,fanquake/bitcoin,lateminer/bitcoin,instagibbs/bitcoin,ElementsProject/elements,particl/particl-core,fujicoin/fujicoin,bitcoin/bitcoin,MeshCollider/bitcoin,bitcoin/bitcoin,fanquake/bitcoin,yenliangl/bitcoin,MeshCollider/bitcoin,apoelstra/bitcoin,GroestlCoin/bitcoin,sstone/bitcoin,tecnovert/particl-core,jamesob/bitcoin,prusnak/bitcoin,jambolo/bitcoin,pstratem/bitcoin,instagibbs/bitcoin,n1bor/bitcoin,ajtowns/bitcoin,pataquets/namecoin-core,pstratem/bitcoin,fujicoin/fujicoin,namecoin/namecore,GroestlCoin/bitcoin,ElementsProject/elements,n1bor/bitcoin,ElementsProject/elements,JeremyRubin/bitcoin,andreaskern/bitcoin,GroestlCoin/GroestlCoin,domob1812/bitcoin,jambolo/bitcoin,fujicoin/fujicoin,domob1812/namecore,instagibbs/bitcoin,jambolo/bitcoin,dscotese/bitcoin,domob1812/bitcoin,anditto/bitcoin,ajtowns/bitcoin,achow101/bitcoin,n1bor/bitcoin,bitcoinsSG/bitcoin,namecoin/namecore,ajtowns/bitcoin,bitcoinsSG/bitcoin,apoelstra/bitcoin,apoelstra/bitcoin,jamesob/bitcoin,mm-s/bitcoin,AkioNak/bitcoin,anditto/bitcoin,apoelstra/bitcoin,domob1812/bitcoin,pstratem/bitcoin,bitcoinknots/bitcoin,fanquake/bitcoin,andreaskern/bitcoin,apoelstra/bitcoin,jlopp/statoshi,namecoin/namecoin-core,sstone/bitcoin,ajtowns/bitcoin,MeshCollider/bitcoin,AkioNak/bitcoin,domob1812/namecore,AkioNak/bitcoin,lateminer/bitcoin,mruddy/bitcoin,andreaskern/bitcoin,sipsorcery/bitcoin,anditto/bitcoin,lateminer/bitcoin,fanquake/bitcoin,mruddy/bitcoin,achow101/bitcoin,dscotese/bitcoin,andreaskern/bitcoin,GroestlCoin/GroestlCoin,yenliangl/bitcoin,mm-s/bitcoin,GroestlCoin/GroestlCoin,jlopp/statoshi,lateminer/bitcoin,JeremyRubin/bitcoin,n1bor/bitcoin,Sjors/bitcoin,fanquake/bitcoin,ajtowns/bitcoin,domob1812/namecore,kallewoof/bitcoin,particl/particl-core,sstone/bitcoin,Xekyo/bitcoin,GroestlCoin/GroestlCoin,qtumproject/qtum,jlopp/statoshi,jambolo/bitcoin,prusnak/bitcoin,mruddy/bitcoin,dscotese/bitcoin,qtumproject/qtum,fujicoin/fujicoin,bitcoinsSG/bitcoin,sipsorcery/bitcoin,tecnovert/particl-core,namecoin/namecore,andreaskern/bitcoin,namecoin/namecoin-core,instagibbs/bitcoin,domob1812/bitcoin,practicalswift/bitcoin,MarcoFalke/bitcoin,achow101/bitcoin,GroestlCoin/bitcoin,JeremyRubin/bitcoin,practicalswift/bitcoin,rnicoll/bitcoin,dscotese/bitcoin,yenliangl/bitcoin,ElementsProject/elements,bitcoin/bitcoin,particl/particl-core,MarcoFalke/bitcoin,lateminer/bitcoin,Sjors/bitcoin,namecoin/namecoin-core,yenliangl/bitcoin,mruddy/bitcoin,JeremyRubin/bitcoin,namecoin/namecoin-core,MeshCollider/bitcoin,mm-s/bitcoin,n1bor/bitcoin,rnicoll/bitcoin,dscotese/bitcoin,rnicoll/bitcoin,bitcoinknots/bitcoin,achow101/bitcoin,practicalswift/bitcoin,Xekyo/bitcoin,AkioNak/bitcoin,sipsorcery/bitcoin,pstratem/bitcoin,jlopp/statoshi,jlopp/statoshi,jambolo/bitcoin,MeshCollider/bitcoin,namecoin/namecore,Sjors/bitcoin,practicalswift/bitcoin,qtumproject/qtum,jamesob/bitcoin,Xekyo/bitcoin,kallewoof/bitcoin,yenliangl/bitcoin,practicalswift/bitcoin,prusnak/bitcoin,sipsorcery/bitcoin,jambolo/bitcoin,namecoin/namecoin-core,Xekyo/bitcoin,domob1812/namecore,kallewoof/bitcoin,particl/particl-core,mruddy/bitcoin,JeremyRubin/bitcoin,AkioNak/bitcoin,GroestlCoin/GroestlCoin,Sjors/bitcoin,domob1812/bitcoin,yenliangl/bitcoin,bitcoinsSG/bitcoin,prusnak/bitcoin,prusnak/bitcoin,anditto/bitcoin,mm-s/bitcoin