relax SVN archive

Created compile_2nd_matrix_pseudo_ellipse() for numerically making the 2nd degree frame order matrix.

A series of part_int_daeg2_pseudo_ellipse_**() supplementary functions have been added for this
numerical approximation. The function is also unit tested.

Fix for the print_frame_order_2nd_degree() fn, sys.stdout overwriting now works.

Created compile_1st_matrix_pseudo_ellipse() for numerically making the 1st degree frame order matrix.

A number of new supplementary functions have been added for this numerical approximation:
part_int_daeg1_pseudo_ellipse_xx()
part_int_daeg1_pseudo_ellipse_yy()
part_int_daeg1_pseudo_ellipse_zz()
tmax_pseudo_ellipse()

Large speed ups of the Ln3+ position finding system test.

For for a bug introduced in the last revision (r11314).

The fixed probabilities were not being set for the Ln3+ optimisation case.

Pre-defined probabilities can now be used in the 'fixed' N-state model optimisation.

Fixed the align_tensor.delete() arg unit test to accept None as an arg.

The align_tensor.delete() user function can now be used to remove all tensors simultaneously.

Made a RelaxError less stringent so that the paramagnetic centre can be unfixed.

Added a system test to back-calculated RDCs from a PCS derived alignment tensor.