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

Patches provided by Joel Baker in PR 22366, verified by myself.

Remove some unneccessary kmem open/close code.

Fix a long standing bug.

Old kvm_mkdb had a possibility to check old kernel's version
string retained at a hole between text segment and data segment.
It might happen a misunderstanding that the run

Fix a long standing bug.

Old kvm_mkdb had a possibility to check old kernel's version
string retained at a hole between text segment and data segment.
It might happen a misunderstanding that the running kernel's version
matches kvm.db's version.

This had been caused by checking current kernel's version string
via /dev/kmem. The version string can get via sysctl, so use it!

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deprecate register, use memset/memmove instead of bzero/bcopy

WARNSify, getopt returns -1 not EOF

make testdb() fail if database version string has length zero.

Create only /var/db/kvm.db, and only create it if it doesn't
already match the running kernel. Fixes an inconsistency
where /var/db/kvm_filename.db would be created, but only
if /var/db/kvm_netbsd.d

Create only /var/db/kvm.db, and only create it if it doesn't
already match the running kernel. Fixes an inconsistency
where /var/db/kvm_filename.db would be created, but only
if /var/db/kvm_netbsd.db didn't match the running kernel.

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RCS id police.

Fix up RCS ids.

Update to 4.4-lite, local changes to man page.