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Fix for allegromodern #160

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Fix for allegromodern #160

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rpgoldman
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There were a couple of snippets of code that only work in case-insensitive Lisp. Stumbled on this testing a system that depends on SHOP3 using Allegro modern.

There were some uses of "NIL" (all caps) which broke compatibility
with Allegro's modern, case-sensitive Lisp, because it wasn't the
default case ("nil").
@rpgoldman
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This is going to be more difficult than I had originally thought: even if we support modern mode code, we should really case-flatten the SHOP language constructs like domains and problems, or the tests will be hard to maintain, and we will collide with PDDL practice (PDDL is case-insensitive).

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