RFR: 6960: Update Copyright year and Welcome page

Sat Oct 31 12:17:51 UTC 2020

On Sat, 31 Oct 2020 07:32:32 GMT, Guru Hb <ghb at openjdk.org> wrote:

> Fix contains : 
> 1. Updating Copy right year 
> 2. Copyright notice should now show "All rights reserved." (Text shows in JMC application -- About box, License detail etc.. and not in the source header). 
> 3. JOverflow was listed as addition / optional plugin , which is not true any more as it is distributed along with jmc product. 
> 4. Few html page had missing "JDK" prefix for "mission control". which is now shown as "JDK mission control" instead of "mission control"

Marked as reviewed by hirt (Lead).

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PR: https://git.openjdk.java.net/jmc/pull/149