The Tool and Repository classes have had a lot bolted onto them over

time, and this has led to a mess. Constants, class attributes,

Properties, public methods, private methods, special double-underscore

methods were shuffled around, making it a bit less clear where anything

should go.
This change reorders them so they're in our standard member order. This

may make some merges a bit difficult short-term, but will help keep

consistency long-term as repository functionality grows.

Unit tests pass.