fix: removed unused code as suggest by githubs codeql

pysisyphus/wavefunction/dma.py

@@ -15,7 +15,6 @@
 #     Benda, Cances, Ehrlacher, Stamm, 2022
 
 
-import dataclasses
 import itertools as it
 import time
 from typing import Tuple

scripts/gen_m2m.py

@@ -3,6 +3,9 @@
 """
 Generate python code to shift multipoles.
 See pysisyphus.wavefunction.dma for more information.
+
+Requires the sympleints-package:
+    https://github.com/eljost/sympleints
 """
 
 import black
@@ -107,16 +110,6 @@ def get_W_sym(L_max: int = _LE_MAX):
     expr = expr.evalf(PREC)
     Wsym[key] = expr
 
-# All non-zero keys
-present_keys = set(Wsym.keys())
-# Search for keys in all_keys for values that aren't 0.0.
-nonzero_keys = [key for key in all_keys if key in present_keys]
-# We can select nonzero_keys to get the expressions in the correct order
-W_exprs = [Wsym[key] for key in nonzero_keys]
-
-# Common subexpression elimination
-repls, reduced = sym.cse(W_exprs, order="none", optimizations="basic")
-
 Wmat = sym.ImmutableSparseMatrix(num, num, Wsym)
 # Dummy multipole matrix
 Q = sym.MatrixSymbol("Q", 1, num)