grafx - Extensible Java Graphics Package Code

Updating comment regarding which audio clips are expected.

Adding launch-level-test.sh. Minor comment modifications in
SynchronizedModeGameRecorder.java. SinglePlayerLevelAction now implements
SuspendResume. LevelTest also now implements SuspendResume.

In launch-nightmare-mode-test.sh, adding ability to specify level.

Removing unnecessary import statement, embellishing comments.

Adding NightmareLevels.java. Can't decide between 'NightmareLevels' and
'NightmareModeLevels'.

Adding a couple of played games, by computer player.

Starting to add copyright notices to shell scripts. Making
launch-computer-player-test.sh have ability to choose level without script
modification.

Adding a new level, 6x5 pit w/ 6-er blocks.

Fine-tuning qSearchBreadth, qEpsilon, and nEpsilon. In particular I put
emphasis on choosing a move that is appealing as far as only the current block
is concerned. This is why nEpsilon is low (0.0001) and this is why qEpsilon is
higher (0.0004). The future possibilities that we consider are not as
important as is the placement of immediate block, in my opinion. This sort of
conundrum has been causing problems in the past.

Improving comments in BlockPlacementStrategy.java.