Summary
This PR adds a Requires: 32, 43 header to BIP-0044.
Motivation
BIP-0044 explicitly states in its abstract and specification that it is based on the HD wallet structure defined in BIP-0032 and applies the purpose scheme defined in BIP-0043.
This dependency is currently described in the text but could be extended to the preamble.
This change would make BIP-0044 more consistent to the BIP process and would make its interoperability with other BIPs clearer.