Increase binding strength of TEST keyword

Previously, it had very low binding strength (the same as elapsedTime,
etc).  We decrease its binding strength just below that of SPACE so it
will behave the same as it did when it was a method.

M2/Macaulay2/d/binding.d

@@ -311,7 +311,7 @@ bumpPrecedence();
      export elapsedTimeS := special("elapsedTime",unaryop,precSpace,wide);
      export elapsedTimingS := special("elapsedTiming",unaryop,precSpace,wide);
      export shieldS := special("shield",unaryop,precSpace,wide);
-     export TestS := special("TEST",unaryop,precSpace,wide);
+     export TestS := special("TEST",unaryop,precSpace,precSpace-1);
      export throwS := special("throw",nunaryop,precSpace,wide);
      export returnS := special("return",nunaryop,precSpace,wide);
      export breakS := special("break",nunaryop,precSpace,wide);