NOT does *not* implement compare(); the method body in
EntityComparisonOperator will throw UnsupportedOperationException.  In
addition, the generated sql with be 'foo NOT bar', which I don't think
is valid.

In actuality, NOT should be a Join operator; however, the condition
system doesn't support a Join operator that takes a single expression.

I've grepped all java source files, and nothing uses the NOT operator.
 I haven't searched any other supplementary code files.

Should I work at trying to fix this, or should NOT just be removed, as
it's never actually worked at all.

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