o getopt returns -1 rather than EOF on errors
o getopt returns '?' for characters it doesn't know about, so
don't include them in the getopt options string.
This will make a number of things easier in the future, as well as (finally!)
avoiding the Id-smashing problem which has plagued developers for so long.
Boy, I'm glad we're not using sup anymore. This update would have been
insane otherwise.
