Add logging output in case we stumble across a bad subkey.
Add logging output in case we stumble across a bad subkey.

moocowmoo/pycoin,thirdkey-solutions/pycoin,tomholub/pycoin,Kefkius/pycoin,Pan0ram1x/pycoin,antiface/pycoin,moocowmoo/pycoin,gitonio/pycoin,ptcrypto/pycoin,Magicking/pycoin,antiface/pycoin,thirdkey-solutions/pycoin,ptcrypto/pycoin,richardkiss/pycoin,zsulocal/pycoin,zsulocal/pycoin,mperklin/pycoin,XertroV/pycoin,devrandom/pycoin,Magicking/pycoin,pycoin/pycoin,shayanb/pycoin,Pan0ram1x/pycoin,shivaenigma/pycoin,Kefkius/pycoin,shivaenigma/pycoin,XertroV/pycoin,pycoin/pycoin,devrandom/pycoin,shayanb/pycoin,tomholub/pycoin,richardkiss/pycoin,gitonio/pycoin,mperklin/pycoin