Fixed compile error in ProgressBar
Added Graph::EdgeNode::isSelfEdge
Added Sawyer::Container::Stack
A few new methods for histograms
Added Sawyer::Cached
Listing log facilities is considered a help-like operation

The configureDiagnostics switch action will exit when the
facilities state is listed if exitOnHelp is true.
SharedFromThis no longer inherits from SharedObject

This allows SharedFromThis to be injected into the class
hierarchy at any position and multiple positions.