Replaced EQ with EQT and SUBTYPEP with SUBTYPEP* in many places.
These are the same as the original except they are guaranteed to return T when a true value is to be returned. Added NOTNOT, which coerces true to T. These changes are intended to make the test more fully standard compliant, avoiding the unwarranted assumption that a function that returns true is returning T (even though this is the case in many implementations.) Added tests for NIL, T, NOT, and NULL.
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