- added readers field into refchan head
- introduced "sigil" PUBLIC artefact (sign-pk, (encrypt-pk, metadata))
- partial ccompatibility (new version reads older heads,
old version wan't read new heads with readers (but will read new heads
without readers)
- RefChanHeadBlockSmall is to delete in nearest future
- RefChanHeadBlock1 is to be a single RefChanHeadBlock
- Yes, absense of readers initially was a fuckup
- Object's versioning approaches are in their way of
tries and failes