Improve argument handling and related messages #39
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Add -p necessary when specifying port parameter. Remove unneeded <options>.
Handle special getopt() return values to write message, usage and exit; if option is not recognised (?) if required argument to option is missing (:) Write message, usage and exit if getopt() encounters a non-option argument. Write message when exiting because of missing layout file. Add h option that writes usage and exits.
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As suggested in #38.