[MlMt] Scroll by line

[Kai Großjohann]

Hi all,

I'd like to be able to scroll the current message by lines, perhaps 
comma scrolls a line up and period scrolls a line down.

I'm aware of `scrollPageDown:` and `scrollPageUp:`, do `scrollLineDown:` 
and `scrollLineUp:` exist?

Thanks,
Kai
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