relax SVN archive

Added many more checks for the package __all__ lists.

Shifted the test___all__() method into the PackageTestCase base class.

Tidying up of the docstrings and printouts of the Test___init__ test class.

Added a unit test checking the generic_fns.structure.__all__ list.

Created a script to test optimisation on various systems.

This just runs the optimisation system tests, collecting and printing the architecture info and
optimisation stats.

Improvements to the optimisation tests and fixes for bug #14173, bug #14174, bug #14175, bug #14176, bug #14177, bug #14182.

The bugs were reported by Jack Howarth (https://gna.org/users/jhowarth) and Seb
(https://gna.org/users/semor).

The architecture info and optimisation stats for a number of systems have been added to the file for reference.

Added a function intro text for the script() user function.

Fix for the script() user function.

The function intro flag at the end of executing an external script was not being restored.

The frame order minimisation now first checks if the tensor reductions have been specified.

Created the new maths_fns.rotation_matrix.R_to_euler_zyz() function and associated unit test.