Retire Forum in Favor of GitHub Issues

[William]

I'm toying with the idea of disabling this forum and moving discussion to GitHub issues in an effort to minimize communication paths that I monitor. Some thoughts, in no particular order:

• Most of the sample programs that have been posted I've put into the dyn4j-samples project on GitHub.
• The forum itself would remain accessible for the foreseeable future in read-only mode.
• One less tool that I need to keep up to date.
• Potentially more appealing for contributions.
• Less spam.

Thanks,
William