TxIn.public_key_sec(): Atempt to return the public key
TxIn.public_key_sec(): Atempt to return the public key

Split the method TxIn.bitcoin_address() into two methods:
one attempts to return the public key of tx_in signature script,
the other, using the previous one, returns the corresponding
bitcoin address.

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