Fix READTABLE-CASE.CASE tests

Michał Herda requested to merge mherda/ansi-test:readtable-case.case into master

Fixes #20 (closed) and #21 (closed)

This fixes the symbol-interning issues that might have occured when READ-FROM-STRING was internally called in the wrong package.

This also fixes the fact that the test names had no home package.

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