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This method will use the (also new) LinkService if it is available to
retrieving just the links for a MerkleDAG without necessary having to
retrieve the underlying block.

For now the main benefit is that the pinner will not break when a block
becomes invalid due to a change in the backing file.  This is possible
because the metadata for a block (that includes the Links) is stored
separately and thus always available even if the backing file changes.

License: MIT
Signed-off-by: Kevin Atkinson <k@kevina.org>