grafx - Extensible Java Graphics Package Code

Fixing another small bug in computation of total, forgot to cast int to double.
In CoveredHoleMetric.

Fixing one little issue by negating canPlugHoleWithoutPlacingCubeAbove().

Making progress on actual judgePit() function in CoveredHoleMetric.

Adding another kickass comment describing a very interesting scenario, in
CoveredHoleMetric.

Working on the comments at the beginning of CoveredHoleMetric. This is looking
pretty good now.

Changing little tidbits in CoveredHoleMetricUtils. Nearing completion.
Proofread but untested.

Moving canPlugHoleWithoutPlacingCubeAbove() to CoveredHoleMetricUtils, starting
to clean up CoveredHoleMetric.

Embellishing comments some more in CoveredHoleMetric.

Adding more examples for canPlugHoleWithoutPlacingCubeAbove().

Implemented canPlugHoleWithoutPlacingCubeAbove() in CoveredHoleMetric, but want
to proofread (and of course test eventually). Gave some examples in a comment.
Want to add at least one very complex example. Also in removed an irrelevant
comment.