[ms] more planning bug fixes * fix sourcesterms w/ constant: all occurences of the same constant should be there once one of them is * fix handling of constant and relation in expand_terms: * we should always consider system source there for constants * for relation, we should check its lhs and rhs are in selected terms, not that the relation is in linkedterms (this has no chance to be true) This fixes 3 tests that were either passing erroneously (syt should be punished for copy/paste output as test reulst without triple checking it) or were not optimal.

[MESSAGES CONTROL]
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