lei p2q: use LeiInput for multi-patch series

The LeiInput backend now allows p2q to work like any other
command which reads .eml, .patch, mbox*, Maildir, IMAP, and NNTP
input.  Running "git format-patch --stdout -1 $COMMIT" remains
supported.

This is intended to allow lower memory use while parsing
"git log --pretty=mboxrd -p" output.  Previously, the entire
output of "git log" would be slurped into memory at once.

The intended use is to allow easy(-ish :P) searching for
unapplied patches as documented in the new example in the
manpage.

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