GitLab

* remove ErrNotFound - it isn't used. If we want to type not-found errors, we
  should consider adding a new error "subtype" field. All the current errors are
  effectively transport-level errors.
* remove ErrFatal - it's unclear how this should be handled.
* add ErrRateLimited - requested by @MichaelMure
* add ErrForbidden

Run standard gofmt command on project root.

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

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