Feature - always on - further improvements
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drama command only available when undrama has run, and undrama command only available when drama has run,
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undrama; undo and unset MANPATH, CLASSPATH, PYTHONPATH, and LD_LIBRARY_PATH if they become empty, unset functions set by drama.sh,
Changes have been in use on Veloce system aatliw since December 2022, but have not until now been proposed for wider use.