New command shbasis
New command shbasis

Command shbasis examines the power present in each SH coefficient volume, and uses the difference in power between m==0 and m!=0 coefficients to estimate whether or not an SH image was generated using the old non-orthonormal basis, or the new orthonormal basis.
Additionally, command-line options may be used to convert the image data in-place to conform to the desired basis.
Discussed in Issue #38.

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