relax SVN archive

This is a major feature and bugfix release. It fixes a failure when loading relaxation data, adds
Python 3 support for using the NMRPipe showApod software, and Python 2.5 fixes for the
align_tensor.display user function. Features include a large expansion for the
align_tensor.matrix_angles and align_tensor.svd user functions to support the standard inter-matrix
angles, the unitary 9D vector notation {Sxx, Sxy, Sxz, Syx, Syy, Syz, Szx, Szy, Szz}, and the
irreducible spherical tensor 5D basis set of {A-2, A-1, A0, A1, A2} for correctly calculating the
inter-tensor angles, singular values and condition numbers.