message: Made keyword arguments for VarMap optional
diff: @@ -237,7 +237,10 @@ cdef class Vec:
  return self.ptr.readFromFile(&filename[0])
  cdef class VarMap:
  - def __cinit__(self, MPI.Comm comm, int owned_size):
  + def __cinit__(self, MPI.Comm comm=None, int owned_size=0):
  + if comm is None:
  + self.ptr = NULL
  + else:
  self.ptr = new TACSVarMap(comm.ob_mpi, owned_size)
  self.ptr.incref()
  