* Use a long to refer to the volume of a region, and rename the method to getVolume
* Fixed issues noted in review
* Forgot to floor
* Fixed review notes
* Can use a long here rather than BigDecimal
* Improve javadocs
* style
(cherry picked from commit 328030fd6281e58a4ea1d0cdd0a2e274da90afbe)
This converts the project into a multi-module Gradle build.
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