relax SVN archive

This is to test the Frame Order distribution generating base script, used for creating the synthetic
Frame Order test data, and to demonstrate a failure in handling back-calculated RDC data.

To implement this, the test_suite/shared_data/frame_order/cam/ path has been converted into a Python
package (with the addition of the __init__.py files). The base data generation script
test_suite/shared_data/frame_order/cam/generate_base.py has also been modified to use the absolute
path for the data files and its run() method now accepts the save_path argument to allow the files
to be saved into a temporary directory.