Improved asset lists.

OLD: Nondunder files list before dunder files:

    Red Example Score (2013) - materials - instrumentation

       1: definition.py
       2: output.py
       3: __init__.py
       4: __metadata__.py
       5: versions/

NEW: Files list strictly alphabetically:

    Red Example Score (2013) - materials - instrumentation

       1: __init__.py
       2: __metadata__.py
       3: definition.py
       4: output.py
       5: versions/