* contrib/sly-mrepl.el (:copy-to-repl, :evaluation-aborted): Use
`sly-mrepl--insert-output' to insert notes.
(:copy-to-repl): Simplify. Doesn't need to `mrepl--send-input'
(:copy-to-repl, :evaluation-aborted, :write-string): Use
`sly-mrepl--catch-up'
(sly-mrepl--catch-up): New function.
(sly-mrepl-insert-input): Fix error when getting input.