Drop dates from copyright lines

public-inbox has started to drop dates from its copyright lines,
pointing to the recommendation at

  https://www.linuxfoundation.org/blog/copyright-notices-in-open-source-software-projects/

I regularly fail to keep copyright lines up to date, so I'll gladly
follow suit.

While touching these lines, change "all contributors" to "all piem
contributors" to get a bit closer to the variants recommended in the
above article.

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