Copyright headers for all files I modified.

Robert requested that I add myself to the copyright headers for any changes I made. This commit contains that. But there's a few caveats:

1. Please double-check that I added the copyright line correctly.
2. I consider my changes to JDI trivial, so I didn't add those.
3. I tagged *every* file that git says I modified. This is because small changes were likely part of larger functionality contributions.

Let me know if you prefer a different tagging strategy.