relax SVN archive

Added all the 12 Euler angle notations to the rotation matrix module.

The methods added include:
axis_angle_to_euler_ijk(),
euler_ijk_to_axis_angle(),
euler_ijk_to_R(),
R_to_euler_ijk(),
reverse_euler_ijk().

Bug fix for the calc_rotation() function.

The axis permutation for | Azz | >= | Ayy | >= | Axx | is now correctly performed.

Bug fixes for the calculation of the anisotropic and rhombic alignment tensor parameters.

Added geometric parameters to the align_tensor.display() print out.

Added the rhombicity R and asymmetry eta parameters to the alignment tensor object.

Renamed the rotation matrix back to 'rotation'.

This is because R will be used as the 'R' alignment tensor parameter.

Added the anisotropic Aa and rhombic Ar parameters to the alignment tensor object.

Fixes for the alignment tensor unit tests (due to object renaming).

N-state model fix for the alignment tensor object renaming.

Cut and paste bug fix for the alignment tensor diagonalisation function calc_A_diag().