relax SVN archive

Copyright notice update.

Modified the import of euler_zyz_to_R to allow easy switching later on to a different notation.

Clean up of the sub_divide() method.

A docstring has been written, the sub_grid() method has been absorbed into one line of sub_divide()
simplifying the code paths, and comments have been added coving all statements.

Converted a number of methods to private methods.

Added a docstring to the __iter__() method.

Removed the nesting of the Iterator class.

Alphabetical ordering of methods.

Redesigned and cleaned up how the Grid_info class is initialised.

This is necessary as the grid_ops data structure was eliminated from the 1.3 line a long time ago.
Now the lower, upper, and inc data structure structures are passed in. In __init__(),
calc_grid_size(), calc_grid_values(), and calc_strides(), the code has been cleaned up, comments
added, and docstrings written.

Modified the Grid_info class remove the grid_ops arg.

This is now removed and subdivided into 'inc', 'lower', and 'upper' in the 1.3 line.

The Grid_info class is now being imported.