Fixed a typo that broke automatic youtube video support in addurl.

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Now there's an easy way to get an overview of how close your repository is to meeting the configured numcopies settings (or when it exceeds them).

# time git annex info . 
[...]
numcopies stats: 
    numcopies +0: 6686
    numcopies +1: 3793
    numcopies +3: 3156
    numcopies +2: 2743
    numcopies -1: 1242
    numcopies -4: 1098
    numcopies -3: 1009
    numcopies +4: 372

This does make git annex info slow when run on a large directory tree, so --fast disables that.