Annotated redundant constraints #6
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I wrapped redundant constraints with redundant_constraint/1 and symmetry_breaking_constraint/1, respectively, where such an "annotation" was missing.
I considered all constraints with a comment mentioning "symmetry", "symmetric", "symmetries", "redundant", or "implied".
I also added a small script (quickcheck.sh) that, for each problem, tries to compile the smallest instance. (There is a number of problems that do not compile any more, for various reasons.)