WIP: DerivationFrameworkTools: Add DeltaRAugmentationTool

This adds a new tool to DerivationFrameworkTools that decorates the elements in a xAOD::IParticleContainer with the minimum deltaR to elements in a reference xAOD::IParticleContainer that pass a user-defined selection. It has been tested with small-R jets as the objects to be decorated and large-R jets as the reference objects as well as with tracks as the objects to be decorated and large-R jets as the reference objects. It has also been tested with and without a selection string.

A minor change is also made to DeltaRTool to correct typos in the comments.