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Port 2021 04 19

See merge request dms3/public/go-dms3ld-format!1

Allowing custom NavigableNode implementations

Revert ErrNotFound improvements

This reverts commit 3d8b6894.

Revert "ErrNotFound: Make struct. Expose Cid field. Implement NotFound()"

This reverts commit 0ae16c84.

Revert "Improve "merkledag: not found" error"

This reverts commit d6515058.

fix: change the batch size to avoid buffering too much

Otherwise, the max outstanding blocks/size depends on the number of cores.

Improve "merkledag: not found" error

Based on #33, taking advantage of the rather new Is() methods from the errors
package to check for equality.

doc: add a lead maintainer

dep: update go-cid

So we can force upstream to update, even if they don't directly depend on go-cid.

License: MIT
Signed-off-by: Jakub Sztandera <kubuxu@protonmail.ch>

Add a DAG walker with support for IPLD `Node`s

Add a `Walker` structure with a simple interface to iterate and search inside DAGs, where a DAG need not be DAG of IPLD nodes but any graph of nodes meeting the `NavigableNode` interface.

Add a `NavigableIPLDNode` structure (encapsulating the IPLD `Node` interface) that implements the `NavigableNode` interface that allows to traverse a DAG of IPLD `Node`s with support for node promises.

License: MIT
Signed-off-by: Lucas Molas <schomatis@gmail.com>

Add BufferedDAG wrapping Batch as a DAGService.

Make Batch implement a NodeAdder interface