[auxpow] Guarantee backward compatibility on getauxblock
[auxpow] Guarantee backward compatibility on getauxblock

Adds a wrapper around getauxblock to return boolean responses
for getauxblock rather than bip22 responses.

psionin/smartcoin,koharjidan/dogecoin,koharjidan/dogecoin,psionin/smartcoin,koharjidan/dogecoin,patricklodder/dogecoin,psionin/smartcoin,patricklodder/dogecoin,dogecoin/dogecoin,patricklodder/dogecoin,dogecoin/dogecoin,psionin/smartcoin,psionin/smartcoin,dogecoin/dogecoin,dogecoin/dogecoin,koharjidan/dogecoin,patricklodder/dogecoin,koharjidan/dogecoin,psionin/smartcoin,patricklodder/dogecoin,dogecoin/dogecoin,dogecoin/dogecoin,koharjidan/dogecoin