- repair usage() output

- when changing display.foo settings, print "display.foo -> bar" like done
for mouse.* and keyboard.*
- use warn() over err() whenever possible and appropriate code path to display
as much as useful information as possible even if one ioctl fails. This is
especially useful to get the display.* settings via wsconsctl -a if your
mouse can't be probed, like on the iBook.

ok mcikye@

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