Completely rewritten to avoid keeping any state. The monitor now checks

Completely rewritten to avoid keeping any state.  The monitor now checks
all of the output from bos status against a set of known-okay regexes and
throws an alert if there's any line in the bos output that isn't okay.
This means that this check will no longer catch a server restart that
successfully completed before the probe ran, but on the plus side it also
won't throw additional errors when the file server has come back up (since
the correct output is still different than the old incorrect output).

Also redid the coding style, added real option parsing, required the
standard Nagios -H option, and added full documentation.