Fix regular expression exact matching
Update to use latest Astropy functionality which allows only certain fields to be shown for labels
Start working on a new combined formatter/locator class that helps make sure the format is consistent with the spacing
Reset spacing if format doesn't match
Implement automated density-based spacing and removed obsolete code
Make code compatible with Python 2 and 3 via six.py
Removed unused code
Simplify internal API
PEP8