Commit 1b38225b authored by Committed by Francois-Rene Rideau
Add and export a register-immutable-system function.
Make *immutable-systems* also respect preloaded-systems. Don't clear immutable-systems as part of clear-system and clear-defined-system. Export register-preloaded-system. Add a test, ensure bugs are fixed. This code was written by Dave Cooper then tweaked by Francois-Rene Rideau.
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