[NET-209] Make results backwards compatible

[pollaro]

To enable old, pre-network test refactor, this needed to happen. Finally had time to put some work in.

1. Only works with results_as_struct
2. Cohen's D may not be available for all tests.
3. Only uncorrected ranking is available

So, here's what's happening:

1. Load the struct
2. Grab the test_options, network_test_options, and network_atlas.
3. For each test type, create a NetworkTestResult object
4. Copy over results

In plotting, old results are checked by checking the values and presence of certain fields. If the results are "old" that have been converted, then the ranking option is disabled. If Cohen's D was not run, then filtering by it is also disabled.