relax SVN archive

Wrote node_value_to_python() to convert the XML nodeValue to a python object.

Created xml_to_object() to place the contents of an XML element into a python container.

Renamed PipeContainer.xml_create_pipe_element() to PipeContainer.xml_create_element().

Wrote the Relax_data_store.xml_read() method.

Bug fix for the Relax_data_store.xml_read() method. The self arg was missing!

Fix for the determine_format() function. Only the text "<?xml" is now used to identify an XML file.

Bug fix for the read() function, the file_path object did not exist.

Modified the test_write_results() system test for cross-platform support.

Added a system test for reading a relax 1.3 model-free results file using results.read().

This included the addition of the object_comparison() method for comparing the equality of the
contents of two objects.

Fix for the DummyFileObject.readlines() method.

The last line is empty because of the split() call, and should not be returned.