contrib: Ask for captcha in signet getcoins.py
contrib: Ask for captcha in signet getcoins.py

As the faucet will always ask for a captcha now, the current script is
no longer usable.

Change the script to print the captcha in dot-matrix to the terminal,
using unicode Braille characters.

bitcoinsSG/bitcoin,kallewoof/bitcoin,sstone/bitcoin,mm-s/bitcoin,bitcoinknots/bitcoin,namecoin/namecoin-core,fanquake/bitcoin,kallewoof/bitcoin,particl/particl-core,namecoin/namecore,bitcoinsSG/bitcoin,pataquets/namecoin-core,instagibbs/bitcoin,sstone/bitcoin,dscotese/bitcoin,pataquets/namecoin-core,sipsorcery/bitcoin,sipsorcery/bitcoin,ajtowns/bitcoin,jamesob/bitcoin,dscotese/bitcoin,domob1812/namecore,bitcoin/bitcoin,jambolo/bitcoin,achow101/bitcoin,mruddy/bitcoin,lateminer/bitcoin,tecnovert/particl-core,mruddy/bitcoin,bitcoinknots/bitcoin,prusnak/bitcoin,Xekyo/bitcoin,mm-s/bitcoin,bitcoinsSG/bitcoin,fanquake/bitcoin,mm-s/bitcoin,bitcoinknots/bitcoin,GroestlCoin/bitcoin,GroestlCoin/GroestlCoin,dscotese/bitcoin,sstone/bitcoin,MarcoFalke/bitcoin,mruddy/bitcoin,domob1812/namecore,ajtowns/bitcoin,AkioNak/bitcoin,achow101/bitcoin,andreaskern/bitcoin,sstone/bitcoin,instagibbs/bitcoin,AkioNak/bitcoin,dscotese/bitcoin,ajtowns/bitcoin,bitcoinknots/bitcoin,dscotese/bitcoin,lateminer/bitcoin,fanquake/bitcoin,namecoin/namecoin-core,mm-s/bitcoin,GroestlCoin/GroestlCoin,domob1812/bitcoin,sipsorcery/bitcoin,anditto/bitcoin,namecoin/namecore,MarcoFalke/bitcoin,achow101/bitcoin,instagibbs/bitcoin,pataquets/namecoin-core,bitcoin/bitcoin,mruddy/bitcoin,anditto/bitcoin,jlopp/statoshi,namecoin/namecore,particl/particl-core,tecnovert/particl-core,MarcoFalke/bitcoin,Xekyo/bitcoin,jambolo/bitcoin,jamesob/bitcoin,prusnak/bitcoin,andreaskern/bitcoin,ajtowns/bitcoin,anditto/bitcoin,GroestlCoin/bitcoin,namecoin/namecore,particl/particl-core,anditto/bitcoin,GroestlCoin/GroestlCoin,prusnak/bitcoin,GroestlCoin/bitcoin,fanquake/bitcoin,tecnovert/particl-core,fujicoin/fujicoin,tecnovert/particl-core,anditto/bitcoin,bitcoinsSG/bitcoin,bitcoinknots/bitcoin,lateminer/bitcoin,mruddy/bitcoin,fujicoin/fujicoin,fujicoin/fujicoin,bitcoin/bitcoin,jambolo/bitcoin,pataquets/namecoin-core,jamesob/bitcoin,GroestlCoin/bitcoin,jlopp/statoshi,achow101/bitcoin,mruddy/bitcoin,namecoin/namecoin-core,ajtowns/bitcoin,pataquets/namecoin-core,kallewoof/bitcoin,instagibbs/bitcoin,jlopp/statoshi,particl/particl-core,fujicoin/fujicoin,pataquets/namecoin-core,namecoin/namecore,jambolo/bitcoin,prusnak/bitcoin,jamesob/bitcoin,domob1812/namecore,MarcoFalke/bitcoin,AkioNak/bitcoin,jlopp/statoshi,sipsorcery/bitcoin,lateminer/bitcoin,lateminer/bitcoin,bitcoin/bitcoin,dscotese/bitcoin,domob1812/bitcoin,kallewoof/bitcoin,lateminer/bitcoin,instagibbs/bitcoin,jlopp/statoshi,GroestlCoin/GroestlCoin,domob1812/namecore,anditto/bitcoin,GroestlCoin/bitcoin,achow101/bitcoin,mm-s/bitcoin,andreaskern/bitcoin,sstone/bitcoin,jamesob/bitcoin,sstone/bitcoin,AkioNak/bitcoin,bitcoin/bitcoin,namecoin/namecoin-core,Xekyo/bitcoin,GroestlCoin/bitcoin,GroestlCoin/GroestlCoin,kallewoof/bitcoin,instagibbs/bitcoin,Xekyo/bitcoin,namecoin/namecoin-core,fujicoin/fujicoin,bitcoinsSG/bitcoin,jlopp/statoshi,fanquake/bitcoin,andreaskern/bitcoin,domob1812/bitcoin,fanquake/bitcoin,andreaskern/bitcoin,domob1812/namecore,Xekyo/bitcoin,sipsorcery/bitcoin,namecoin/namecore,namecoin/namecoin-core,prusnak/bitcoin,domob1812/bitcoin,tecnovert/particl-core,jamesob/bitcoin,prusnak/bitcoin,bitcoin/bitcoin,domob1812/bitcoin,AkioNak/bitcoin,mm-s/bitcoin,ajtowns/bitcoin,AkioNak/bitcoin,andreaskern/bitcoin,tecnovert/particl-core,domob1812/bitcoin,kallewoof/bitcoin,sipsorcery/bitcoin,GroestlCoin/GroestlCoin,Xekyo/bitcoin,particl/particl-core,bitcoinsSG/bitcoin,achow101/bitcoin,MarcoFalke/bitcoin,fujicoin/fujicoin,MarcoFalke/bitcoin,domob1812/namecore,particl/particl-core,jambolo/bitcoin,jambolo/bitcoin