MS_NORMS - Browaeys and Chevrot analysis of the elasticity matrix.

Calculate the percentages of the original matrix norm represented by the
individual decompositions of an elasticity tensor C, after:
   Browaeys and Chevrot (GJI, v159, 667-678, 2004)

[P] = MS_norms(C,Ciso)
   Isotropic part (scalar)

[P] = MS_norms(C,Ciso,Chex)
   Isotropic, and hexagonal parts of the elastic tensor (vector)

[P] = MS_norms(C,Ciso,Chex,Ctet,Cort,Cmon,Ctri)
   All parts of the elastic tensor (vector)

Notes:
    Input components of of C must first be calculated using MS_decomp.
    The output vector P will have as may elements as the number of
    decomposed parts of the input matrix that are provided.

References:
    Browaeys, J. T. and S. Chevrot (2004) Decomposition of the elastic
        tensor and geophysical applications. Geophysical Journal
        international v159, 667-678.

See also: MS_AXES, MS_DECOMP