Added sharpness filter#942

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rakama wants to merge 14 commits intooverviewer:masterfrom

Commits on Jul 23, 2012

merged with upstream/master, created 'lemon' branch to add flavor, attempted to optimize base_occluded in base.c, should improve performance by 5% but need to verify that it checks hidden primitive…
rakama
committed

Commits on Jun 7, 2013