[yt-dev] Issue #687: Load test data without an explicit path (yt_analysis/yt)

[Nathan Goldbaum]

New issue 687: Load test data without an explicit path
https://bitbucket.org/yt_analysis/yt/issue/687/load-test-data-without-an-explicit-path

Nathan Goldbaum:

It would be nice if we could load data that lives in the test_data_dir config path without using the full, explicit path.

That way this would work from any folder:

```
#!python

pf = load('IsolatedGalaxy/galaxy0030/galaxy0030)
```

+/- 1?  I'll happily implement this if no one has any objections.