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→Features: Updated the feature list, copying from the CHANGES file.
<section begin=features/>
* Implemented the lib.geometry.vectors.vector_angle_atan2() relax library function. This is for calculating the inter-vector angle using the more numerically stable atan2() formula.
* Implemented the lib.geometry.vectors.vector_angle_acos() relax library function. This is used to calculate the inter-vector angle using the arccos of the dot product formula. The function has been introduced into the relax library as the calculation is repeated throughout relax.
* Expanded the basis sets for the align_tensor.matrix_angles user function to allow the correct inter-tensor angles to be calculated. This includes the standard inter-matrix angles via the arccos of the Euclidean inner product of the alignment matrices in rank-2, 3D form divided by the Frobenius norm of the matrices, irreducible spherical tensor 5D basis set {A-2, A-1, A0, A1, A2}, and the unitary 9D basis set {Sxx, Sxy, Sxz, Syx, Syy, Syz, Szx, Szy, Szz} (all of which produce the same result).
* Expanded the basis sets for the align_tensor.svd user function to allow the correct singular values and condition number to be calculated. This includes the irreducible spherical tensor 5D basis set {A-2, A-1, A0, A1, A2} and the unitary 9D basis set {Sxx, Sxy, Sxz, Syx, Syy, Syz, Szx, Szy, Szz} (both of which produce the same result).
* Added the angle_units and precision arguments to the align_tensor.matrix_angles user function to allow either degrees or radians to be output and the number of decimal points to be specified.
* Added the precision argument to the align_tensor.svd user function to allow the number of decimal points for the singular values and condition number to be specified.
* Updated the align_tensor.display user function to output the irreducible spherical harmonic weights. This is the alignment tensor in the {A-2, A-1, A0, A1, A2} notation.
<section end=features/>
