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License: MIT
Signed-off-by: Bamvor Zhang <jian.zhang@ipfsbit.com>

Signed-off-by: Bamvor Zhang <jian.zhang@ipfsbit.com>

This patch is the part of trickledag work which is similar to the
merkledag work in commit 474b77a2bdb1c ("importer: remove `UnixfsNode`
from the balanced builder"). Two helper functions(fillTrickleRecFSNode
and FillFSNodeLayer) is introduced temporarily for modifing the Layout
functions. These two funtions will be removed when all the code of
UnixfsNode is removed in trickledag.go.

Test ipfs add and get commands to check whether get the same hash of
file after the code changes.

License: MIT
Signed-off-by: Bamvor Zhang <jian.zhang@ipfsbit.com>

A batching DAG service is forced onto the
users of the importers, but they could just wrap
the given DAGSerice in the batching one to get the same
functionality (remembering to Close it at the end of the
proccess).

As detailed in #27, the importers should not be making choices
about what DAGService is the right one to use and wrapping the
given one.

This change requires wrapping the DAGService in go-ipfs into
ipld.Batch. and closing it when Finishing the adding process.

License: MIT
Signed-off-by: Jeromy <jeromyj@gmail.com>