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

Patches provided by Joel Baker in PR 22309, verified by myself.

More and more of .Os cleanups. .Os is defined in the tmac.doc-common file,
so we shouldn't override it with versions in the manpages. Many more to
come.

Merged with 4.4lite.
Changed to conform to NetBSD's new RCS Id convention.

Add RCS identifiers.

initial import of 386bsd-0.1 sources