lei q|lcat: support "-f reply" output format

When composing replies in "git format-patch" cover letters,
I'd been relying on "lei q -f text ...", but that still requires
several steps to make it suitable for composing a reply:

	* s/^/> / to quote the body
	* drop existing In-Reply-To+References
	* s/^Message-ID:/In-Reply-To:/;
	* add an attribute line
	...

"lei q -f reply" takes care of most of that and users will
only have to trim "From " lines, unnecessary results and
over-quoted text (and trimming is likely less error-prone
than doing all the steps above manually).

This should also be a good replacement for
"git format-patch --in-reply-to=...", since copying long
Message-IDs can be error-prone (and this lets you include
quoted text in replies).

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