Move UCB-licensed code from 4-clause to 3-clause licence.

Patches provided by Joel Baker in PR 22280, verified by myself.

add unintrusive Ids

clean up import; kill old cruft.

Upgrade regex routines to alpha3.3.

Update to Henry's Nov 11 release -- no code changes, only the addition of
a copyright file. I'm checking it in now, rather than waiting for the
next "real" release, since the rest of the files do no

Update to Henry's Nov 11 release -- no code changes, only the addition of
a copyright file. I'm checking it in now, rather than waiting for the
next "real" release, since the rest of the files do not have their own
copyright notices.

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