`.actuate` should open `9o`

[DisposaBoy]

The .r keybinding is handled specially by GS which already knows that the user wants to see the output and therefore opens 9o. The .actuate command doesn't have any of this knowledge and so doesn't open 9o.

We don't want to open it all the time because it will become annoying when it resolves to things like goto definition or something that doesn't naturally have output the user wants to see.

A possible solution is to only open 9o if there is some output. it might also make sense to get rid of the special handling in the .r handling code and make it the default OutputStream behaviour.