Use EXIT_SUCCESS and EXIT_FAILURE for return values from main
Use EXIT_SUCCESS and EXIT_FAILURE for return values from main

The old code used 0 on failure and 1 on success (except when it
didn't), but 0 is usually (exception: OpenVMS) used to indicate
*success* and non-zero is used for failures.  This means that,
something like `./MTARI c … && echo Success` wouldn't work.

EXIT_SUCCESS and EXIT_FAILURE have been around since at least C89, so
they should be safe, and they will work everywhere.

davidcatt/FastARI