Added support for Electrum's change addresses
Interface accepts secexp instead of seed
Wallet now caches secexp, changed interface to Algo
Changed API (secexp instead of seed)
A bit polished code
Implemented get_UUID()
Displaying OTP in chunks by three characters for easier rewriting to computer
Improved SigningStateMachine, OTP prints 6 digits-only characters to enable TXes on POS with numeric keypads
Signing template moved to signing.py
Fixed import
Signing template and transaction signing methods