Which parts of the go-toolkit should be moved here?

[chocolatkey]

This repository is planned to be, intially, mostly comprised of code currently residing in the go-toolkit repo. The obvious portion of the code consists of what is currently called the rwp utility, located in https://github.com/readium/go-toolkit/tree/develop/cmd/rwp
However, there may be other portions of the go-toolkit that could be moved to this repository, such as the image inspection code, remote fetchers and more. Any thoughts on other pieces of the code that should be moved?

[mickael-menu]

I would say everything that is directly used by the CLI commands and that we don't want to offer as a Go API to integrators.

So the remote fetchers should probably stay in the Go toolkit, as I guess they could be useful if someone implement their own publication server using the Go API, or if they want to open a remote publication.