Fixing net.blockout.meta.BlockGenerator to name the 1-unit block "O" instead of
"_", the previous name was causing a compile error. It used to work with
Java 1.0, Java 1.1, even with Java 1.2, but apparently not anymore. This
generator now creates a carbon copy of the source file for
net.blockout.production.Blocks, so that source does not need to be adjusted.
It was already adjusted by hand a while back.
