grafx - Extensible Java Graphics Package Code

Adding slightly better Javadoc to Blocks.

Working on better Javadoc, better comments, and even added some commented out
error checking code. BlockGenerator and GenerateBlocks.

Removing a 'throws' clause which isn't relevant, in Blocks.

More improvements to Javadoc in BlockGenerator.

Improving some Javadoc in BlockGenerator.

Improving some Javadoc in BlockGenerator.

Some Javadoc embellishments in BlockGenerator.

Cleaning up Blocks.main().

Fixing an <img> tag in Blocks.

One more little change to Blocks.