Change 'order' to 'ordering' and update circuits_matroids.pxd

Use 'ordering' for consistency with matroid.p*

src/sage/matroids/circuits_matroid.pxd

@@ -18,6 +18,7 @@ cdef class CircuitsMatroid(Matroid):
     cpdef bases(self) noexcept
     cpdef circuits(self, k=*) noexcept
     cpdef nonspanning_circuits(self) noexcept
+    cpdef no_broken_circuits_sets(self, ordering=*) noexcept
 
     # properties
     cpdef girth(self) noexcept

src/sage/matroids/circuits_matroid.pyx

@@ -485,7 +485,7 @@ cdef class CircuitsMatroid(Matroid):
                     NSC.append(C)
         return NSC
 
-    cpdef no_broken_circuits_sets(self, order=None) noexcept:
+    cpdef no_broken_circuits_sets(self, ordering=None) noexcept:
         r"""
         Return the no broken circuits (NBC) sets of ``self``.
 
@@ -494,7 +494,7 @@ cdef class CircuitsMatroid(Matroid):
 
         INPUT:
 
-        - ``order`` -- a total ordering of the groundset given as a list
+        - ``ordering`` -- a total ordering of the groundset given as a list
 
         OUTPUT: a list of frozensets
 
@@ -525,16 +525,16 @@ cdef class CircuitsMatroid(Matroid):
             sage: C1 == C2
             True
         """
-        if order is None:
-            order = sorted(self.groundset(), key=str)
+        if ordering is None:
+            ordering = sorted(self.groundset(), key=str)
         else:
-            if frozenset(order) != self.groundset():
+            if frozenset(ordering) != self.groundset():
                 raise ValueError("not an ordering of the groundset")
 
         # compute broken circuits
         cdef list BC = []
         for C in self._C:
-            for e in order:
+            for e in ordering:
                 if e in C:
                     BC.append(C - set([e]))
                     break