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This allows _trying_ to execute a command on a daemon, failing, and falling back
on another executor.

This is a breaking change and will affect Filecoin. However, filecoin is
currently using this incorrectly anyways (breaking PreRun and PostRun).

We _need_ to do this before calling PreRun but it's also nice to do this before
bothering the server.

This was causing cancel errors to be printed twice.

Only use custom encoders for values.

fixes #65

Also, remove SetEncoder. Always derive the correct encoder from the request.

to func(Response, ResponseEmitter) error

Instead, handle it at the boundaries (in ServeHTTP and the CLI's Run function).
This ensures that we actually *wait* to finish writing everything before
canceling the context.

Also, fix a nil pointer error.

fixes #42

We *always* expect environments to be able to return a context so we might as
well enforce this with the type system.

- made Response.Request() return Request not *Request
- added ResponseEmitter.Tee()
- added a wrapper that wraps a Response and provides an oldcmds.Response

this way we can share the code with the legace commands package and don't have to convert everything

License: MIT
Signed-off-by: Jeromy <why@ipfs.io>

Better fix than #3230 to make sure errors from addAllAndPin make it to
the client.

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

License: MIT
Signed-off-by: Jeromy <why@ipfs.io>