issue/314: fixes for changing the value of the kerning for "AV" and
not seeing it in all the other occurances of AV in the metrics view.

Also, direct edits like changing -5 to -54 will trigger a proper update.
Merge pull request #468 from monkeyiq/2013march/issues/314v2

issue/314: fixes for changing the value of the kerning for "AV" and