Multipole: turn orthogonality test into Cactus test

Multipole: Added code to test mode orthonormality.

Multipole: free memory after orthonormality test

Multipole: disable parfile output in tests

Multipole: use compact_format ASCII output

Multipole: turn orthogonality test into Cactus test

Multipole: speed up orthonormality test by skipping interpolation

Multipole: test only unique (l,m) (li,mi) combinations

Multipole: add orthonormality data to testsuite

Multipole: add test for midpoint rule