Use $(( )) arithmetic expansion instead of `expr something`

No need to use an external tool when the shell can handle this basic task.

Do not suppress error messages to stderr, but remove unnecessary
debug prints. This gives better hints why the tests are failing.

Deprecate vnds in favour of svnds.

In effect, this removes the "old" vndX nodes, and renames
the svndX nodes to vndX.

Old svndX nodes will still continue to work though, for now.

Cleanup according

Deprecate vnds in favour of svnds.

In effect, this removes the "old" vndX nodes, and renames
the svndX nodes to vndX.

Old svndX nodes will still continue to work though, for now.

Cleanup accordingly.

ok deraadt@, todd@
comments and ok on the man page bits from jmc@

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Add regression test suite for FFS, from FreeBSD, okay art@ deraadt@