reduce max size of dinamically allocated arrays to minimize the nasty
behaviour some versions of IRIX exhibit of committing suicide on big
mallocs instead of just returning a friendly null po

reduce max size of dinamically allocated arrays to minimize the nasty
behaviour some versions of IRIX exhibit of committing suicide on big
mallocs instead of just returning a friendly null pointer

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fix comments and renumber rlimit return codes
fix closing of fd's when limit is reached

remove leftover comment

update and split test cases 518 and 537 into its own source code file