The Unicon version of the tester had code to take a big diff and on a section basis,
delete lines beyond a certain count.  As yet, that code hasn't been turned into
Ruby but in this directory is the Icon code that does the computation, packaged
as a standalone program, show_diff.

Build with:
    icont *.icn

    (expands to show_diff.icn tester.icn, causing executable to be named show_diff)