Change:
When a new group is created, the "interim_transcript_hash" field is set to the zero-length octet string. <del> 7.5. </del> <ins> 7.6. </ins> As described in commit, each MLS Commit message needs to transmit a ClientInitKey leaf and node values along its direct path.  The path

Discussion:
The is no longer needed, since CIKs are referenced by hash. ProposalIDs were no longer usable to refer to proposals since we enabled multiple proposals per MLSPlaintext The syntax description for Welcome was invalid
Merge with master obsoleted some changes. I re-implemented the "supportedversion"->"version" change, and added a "keyid" extension to address Benjamin's comment.
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