The manifest had previously been a list for eveyr leevl of the manifest,
and keys were found by folding over the list. By Level 4 the list will
be 4096 items long, and so the fold would be expensive, and would be
required many times.
To make this less expensive an ETS table is to use. However, the ETS
table needs to be shared between snapshots and so in order to use the
ETS the entries to the table need to support multi-versioning - whereby
each clone can see a version of the table at the Manifest SQN the clone
is supporting.
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