A little troubleshooting for alpha 1 and 2

A couple of problems have been reported by
users since the alpha release:

1. The program loader dumps a ZipException
   sometimes.

This will happen if one of the zip/jar
entries in the classpath doesn't exist.
It will be fixed in alpha3.

1. The firmware downloader fails with an
   error: "write: Permission denied."

This seems to happen under Windows if too
many programs are running (presumably if
too many file descriptors are already taken).
Close all programs, or reboot, and try again.

Regards,
--Jose