git-annex log --received modifier option

git-annex log --received modifier option

Only counting received and not dropped makes this show the bandwidth of
data coming into the repository, although only in a sense. Since
git-annex branch updates only happen at the end of a command, and we
don't know when a command started, it's only an approximation of the
actual bandwidth. (A previous git-annex branch update made have
happened in a different repository.)

It would be possible to also add a --dropped option, but I don't know
how useful that would be?

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