Adding bilinear interpolation algorithm for elevation determination#52

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carpenlc wants to merge 3 commits intoOpenMap-java:masterfrom

carpenlc:adding-bilinear-interp

Commits on Oct 9, 2019

Fixing misleading javadoc comment.
Carpenter
committed
Updating interpElevationAt() to utilize the lower points in the interpolation algorithm.
Carpenter
committed
Adding bi-linear interpolation algorithm for elevation post values.
Carpenter
committed