o Correct type safty of option parsing logic
 o Make option toggling work correctly
 o Add "probe_eisa_vlb" as an alias for the "no_probe" option so
   that there is a clearly defined name associated with the command
   line feature that allows eisa_vlb probes to be enabled/disabled
   in the aic7xxx driver.
 o PCI parity error checking defaults to being enabled.