grafx - Extensible Java Graphics Package Code

Making some very minor tweaks. Trying to pass the ultra-hard level 24 on a
regular basis. Still no cigar.

Adding commented out code which prints the covered hole metric.

Adding commented out code for custom BlockSource.

Level 5, changing depth of pit from 7 to 9.

Whoa. This is difficult. The Eval function works well but there are some
loose ends to tie up. Documentation etc.

Adding launch-easy-level-test.sh.

Adding another example of the computation for max column in covered hole.

Breaking out the baseBlockSource.

Trying the added weight for corners and edges, in covered hole metric. Need to
do more testing.

Adjusting metric weights slightly and adding function sqrtEdgesCornersWeight().