Add sendtoaddress support to btcctl.
Add sendtoaddress support to btcctl.

qchain/btcd,BitGo/prova,jongillham/btcd,jcmincke/dcrd,dan-da/btcd,cjepson/btcd,dan-da/btcd,dajohi/btcd,qchain/btcd,jimmysong/btcd,jrick/dcrd,btcsuite/btcd,jrick/btcd,Roasbeef/btcd,jongillham/btcd,btcsuitereleases/btcd,mathiasrw/btcd,cqswxj2013/btcd,jcmincke/dcrd,wallclockbuilder/btcd,sysbot/btcd,1d4Nf6/btcd,soapboxsys/ombfullnode,davecgh/btcd,cqswxj2013/btcd,1d4Nf6/btcd,stevenroose/btcd,Dirbaio/btcd,FactomProject/btcd,jcmincke/dcrd,decred/dcrd,ppcsuite/ppcd-old,CryptocurrencyCabal/htcd,DanielKrawisz/btcd,toddfries/btcd,danoctavian/btcd,glv2/ppcd,runeaune/btcd,jrick/dcrd,danoctavian/btcd,cjepson/btcd,btcsuite/btcd,jrick/btcd,BitGo/prova,Dirbaio/btcd,jimmysong/btcd,Cleawing/btcd,jrick/btcd,aakselrod/btcd,DanielKrawisz/btcd,adiabat/btcd,hectorj/btcd,toddfries/btcd,CryptocurrencyCabal/htcd,davecgh/btcd,Evil-Coin/Evil,adiabat/btcd,Cleawing/btcd,ppcsuite/ppcd-old,aakselrod/btcd,sysbot/btcd,stevenroose/btcd,tb00/btcd,tb00/btcd,pkothbauer/btcd,ltcsuite/ltcd,decred/dcrd,wallclockbuilder/btcd,dajohi/btcd,Roasbeef/btcd,Stash-Crypto/btcd,ppcsuite/ppcd,Dirbaio/btcd,Stash-Crypto/btcd,btcsuitereleases/btcd,ltcsuite/ltcd,FactomProject/btcd,pkothbauer/btcd,runeaune/btcd,ppcsuite/ppcd,hectorj/btcd,mathiasrw/btcd,soapboxsys/ombfullnode,dajohi/btcd,glv2/ppcd,Evil-Coin/Evil