Changing default 8-tap filter to Langrangian interpolator.
The Lagrangian interpolation filter is maximally flat in the passband. There is non-trivial improvement with the hd set, while for derf the results are virtually unchanged. See: http://www.corp.google.com/~debargha/vp8_results/enhinterpn.html (derf) http://www.corp.google.com/~debargha/vp8_results/enhinterpn_hd.html (HD) Patch 2: Updated the results for derf in the html above to use the new baseline. There is still about 4% improvement. Will update the hd baseline later (since it takes 9 hours to run on my machine) Patch 3: By mistake the default filter was left at 60 - should be 0 to use the new interpolation filter. Change-Id: If5f64444976562415d68a2aeabb94fdfa0d47890
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