warn user if imported key has derivation path different from xpub's depth #397
Description
inspired by a discussion in a telegram group.
xpub has a depth encoded. if the user enters xpub and derivation path manually he may enter the wrong derivation path. So we should warn the user if he is importing xpub with depth m whereas the provided derivation path is longer or shorter than that. We should not warn the user if the derivation path is not provided at all though.