Fix in the muRascal library: added the subject subtype check to
MATCH_LIST and MATCH_SET; otherwise, runtime errors in case of a
subject of the value type.
Added pattern matching tests: cases when a match can be false as the
subject dynamic type is not a subtype of the pattern type.
Top-down-break and bottom-up-break strategies seem to work!
Added yet another 'visit' test.
Merge branch 'master' into string-origins
Fixed in org-string equality.
Not sneakily using StringValue anymore.
Origins now returns an lrel.