Patch: Add option to fmt to ignore email reply lines

[Anthony Perkins]

I've added an option to 'fmt' to ignore lines beginning with the
greater-than symbol, so that whole email replies can be piped through
fmt (e.g. via vi from mutt) without needing to repeat the command
for each of my paragraphs.

This is my first real patch, so I would appreciate any feedback.

Many thanks,

Anthony
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