Add option to buffer autoRIFT input imagery around glacier polygons with white noise before dense correlation

[alex-s-gardner]

When there is rock and glacier ice in the same search chip, rock will often dominate the correlation. This creates artificially slow motion on the edges of glaciers and makes very small glaciers hard to resolve. This could be fixed by buffering 1 chip size distance around glacier polygons and filling (replacing image values) with white noise.