Re: [ALTERNATE PATCH] Add a simple option parser.

> The option parser takes argc, argv, an array of struct option
> and a usage string.  Each of the struct option elements in the array
> describes a valid option, its type and a pointer to the location where the
> value is written.  The entry point is parse_options(), which scans through
> the given argv, and matches each option there against the list of valid
> options.  During the scan, argv is rewritten to only contain the
> non-option command line arguments and the number of these is returned.
> 
> Aggregation of single switches is allowed:
>   -rC0 is the same as -r -C 0 (supposing that -C wants an arg).