[rt-users] Hide email quoted text

[der Mouse]

> If instead you try to automate removal of quoted text, you get people
> like me complaining that you can't do inline replies,

Simplest thing here is to remove quoted lines - but only in a
contiguous block at the end of the message.

That'll nuke 90-95% of the problem, based on my (admittedly rather
limited) experience with top-posters.

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