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5f34469f22
Get rid of the notion of a special 'Empty' Commit value, which means
that a freshly created Dataset or DataStore will have no Head at
all. To allow callers to tolerate this, we provide the MaybeHead()
method for them to use when they're unsure about whether a given
Data{set,Store} has ever been committed to.
To ease the API impacts of this change, we've also modified Commit()
to take a types.Value and handle creating a Commit struct holding that
Value and descending directly from the current Head.
Callers who wish to provide alternate parents can use CommitWithParents()