relax SVN archive

Updated the test_matrix_angles_identity() unit test for pipe_control.align_tensor.matrix_angles().

This is the test in the _prompt.test_align_tensor.Test_align_tensor module. The basis set has been
set back to the now non-default value of 0, and the value checks have been converted from
assertEqual() to assertAlmostEqual() to allow for small truncation errors.

Import fix for the frame order CaM system test base script.

The vector_angle() function of the lib.geometry.vectors module is now called vector_angle_normal().

Improvements to the description of the align_tensor.matrix_angles user function.

Implemented a new default basis set for the align_tensor.matrix_angles user function.

This is uses standard definition of the inter-matrix angle using the Euclidean inner product of the
two matrices divided by the product of the Frobenius norm of each matrix. As this is a linear map,
it should produce the most correct definition of inter-tensor angles.

Fix for the 64-bit Linux distribution file md5sum placement.

This is for http://www.nmr-relax.com/download.html.

Updated the log file for comparing different alignment tensor basis sets for align_tensor.svd changes.

Improved the printouts from the align_tensor.svd user function by including the basis set text.

Created a script and log file to demonstrate differences between alignment tensor basis sets.

This shows that the inter-tensor angles and condition numbers are dependent on the basis set used.

Created 6 unit tests for the lib.geometry.vectors.vector_angle_atan2() function.

Added 6 unit tests for the lib.geometry.vectors.vector_angle_acos() function.

These are similar to those of the vector_angle_normal() function but unsigned angles are checked
for.