Fixes signature_form to use the hashcode if a string tx is passed.
Fixes verify_tx_input to pass the hashcode to ecdsa_tx_verify
Adds support for other hashcode types in multisign
Merge pull request #21 from Zah6ooheew/fix_hashcodes

A couple of fixes for signature_form and verify_tx_input for signatures not using SIGHASH_ALL
Merge pull request #22 from Zah6ooheew/add_hashcode_multisign

Adds support for other hashcode types in multisign