2.20.9: fix logical-pathname issue; export more utilities.
The issue fixed is that most Lisps don't like *default-pathname-defaults* being a logical-pathname. Added a test for logical-pathname functionality; it all works on CCL, and works better on other Lisps after the fix, but there are still logical-pathname issues on SBCL, CLISP and more. Also, a package cleanup of our test suite.
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