relax SVN archive

Fixes for the from_xml() method for the structural object.

Fix for the test_duplicate_data_fail1() unit test.

Fixed the test_load_pdb() unit test.

Shifted the setting of the file and path to the specific structural object load_pdb() methods.

Modified these unit tests to check the new file and path structures.

Added some missing imports.

Switched to the internal structural object.

Updated the test_load_results() system test for the new file and path variables.

Fixed the Scientific structural object __init__().

The structural data is no longer initialised (again) and the base class __init__() method is called.

Modified the structural object code to store the file name and path.

This will cause some breakages do to the variable name changes.