Improve how "explode" works -- allow for deep linking to blocks inside
of FINF files.
Add a test
Allow referencing of blocks within FINF files.  Greatly increase code coverage.
Python 3 fixes.
Don't allow directly linking to anything but the first block in an
external file.
Make YAML internal references (anchors and aliases) work.
Support external YAML references.
Fix some file closing issues.
Improved laziness on reference resolution.
Minor fixes.
Increase testing code coverage.
Add safer way to make external reference.
Fix uncollectables.
Use better filenames in exploded form.
Merge pull request #11 from mdboom/flexible-exploded

Explode/Implode