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We call this frequently and having to allocate here is really unfortunate.

* fil-commitment-unsealed
* fil-commitment-sealed

Ref: https://github.com/multiformats/multicodec/pull/161
Ref: https://github.com/multiformats/multicodec/pull/172

During the change to default CIDV1 to Base32, the corresponding code
comment wasn't updated.

Note: this removes two errors that don't appear to be used by anyone.

I'm pretty sure we never call `Parse` multihashes anyways, but we should be careful.

License: MIT
Signed-off-by: Jakub Sztandera <kubuxu@protocol.ai>

Context: https://github.com/multiformats/multicodec/issues/130

License: MIT
Signed-off-by: Marcin Rataj <lidel@lidel.org>

This makes Cid implement https://golang.org/pkg/encoding/#BinaryMarshaler
which is used by go-codec to decide if things know how to serialize themselves
(currently we need do manual wrapping for anything containing a CID).

Since I was at it, I did the TextMarshaling one too.