check_zero_matrix
synopsis: INT check_zero_matrix (OP mat, OP p_root)
description:
Checks that the matrix is zero.
If p_root=0, then the matrix is checked for general q.
Otherwise it is checked for q a primitive p_root of unity.
If there is no ERROR, returns 0 if zero for all q,
1 if zero at primitive p_root of unity, 2 if non-zero.
return:
ERROR, 0, 1, or 2 as described above.
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