grafx - Extensible Java Graphics Package Code

This eval function does very well on the hardest level, level 23, even with the
adjustments made, causing it to have an extremely difficult block distribution.
I tested this and the computer player passed this level at least 5 times in a
row, with not a single failure, with these eval function settings.

Adding comment for plugTheHoleMetric(). This needs some very careful
consideration.

Beginning to work on plugTheHoleMetric().

Adding scripts/launch-hard-level-test.sh.

Adding missing println() for metrics.

Tweaking the linear combination of metrics. Performs well.

Fixing computation of meanAltitude in heightFluctuationMetric().

Having old and new covered hole metrics.

Adding heightFluctuationMetric().

More intelligent weighted average code.