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Spherical Harmonic Transformations

Equally sampled (N×N) and equally spaced (N×2N) Grids
`SHExpandDH`	Expand an equally sampled or equally spaced map into spherical harmonics using Driscoll and Healy's (1994) sampling theorem.
`MakeGridDH`	Create a 2D map from a set of spherical harmonic coefficients that conforms with Driscoll and Healy's (1994) sampling theorem.
`SHExpandDHC`	Expand an equally sampled or equally spaced complex map into complex spherical harmonics using Driscoll and Healy's (1994) sampling theorem.
`MakeGridDHC`	Create a 2D complex map from a set of complex spherical harmonic coefficients that conforms with Driscoll and Healy's (1994) sampling theorem.
Gauss-Legendre quadrature grids
`SHGLQ`	Precompute the weights and nodes used in the GLQ-based spherical harmonics routines.
`SHExpandGLQ`	Expand a 2D map sampled on the Gauss-Legendre quadrature nodes into spherical harmonics.
`MakeGridGLQ`	Create a 2D map from a set of spherical harmonic coefficients sampled on a the Gauss-Legendre quadrature nodes.
`SHExpandGLQC`	Expand a 2D complex map sampled on the Gauss-Legendre quadrature nodes into complex spherical harmonics.
`MakeGridGLQC`	Create a 2D complex map from a set of complex spherical harmonic coefficients sampled on a the Gauss-Legendre quadrature nodes.
`GLQGridCoord`	Compute the latitude and longitude coordinates used in Gauss-Legendre quadrature grids.
Other
`SHExpandLSQ`	Expand a set of irregularly sampled data points into spherical harmonics using a least squares inversion.
`MakeGrid2D`	Create a 2D cylindrical map with arbitrary grid spacing from a set of spherical harmonic coefficients.
`MakeGridPoint`	Evaluate a real function expressed in real spherical harmonics at a single point.
`MakeGridPointC`	Evaluate a complex function expressed in complex spherical harmonics at a single point.
`SHMultiply`	Multiply two functions and determine the spherical harmonic coefficients of the resulting function.

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