Directly compare with operators

Author: Zeroto521

src/pyscipopt/matrix.pxi

@@ -20,11 +20,11 @@ def _is_number(e):
 def _matrixexpr_richcmp(self, other, op):
     def _richcmp(self, other, op):
         if op == 1: # <=
-            return self.__le__(other)
+            return self <= other
         elif op == 5: # >=
-            return self.__ge__(other)
+            return self >= other
         elif op == 2: # ==
-            return self.__eq__(other)
+            return self == other
         else:
             raise NotImplementedError("Can only support constraints with '<=', '>=', or '=='.")