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JetSubStructureMomentTools: adding dichroic JSS

Jason Robert Veatch requested to merge jveatch/athena:21.2-DichroicJSS into 21.2

This MR implements dichroic jet substructure moments to existing tools. The dichroic N-subjettiness ratios are described in https://arxiv.org/abs/1612.03917 and the dichroic ECF ratios are described in https://arxiv.org/abs/1803.07977 (III.2.4.1). Only the ratios that have been described in the theoretical works have been included. The option to perform the dichroic calculations is off by default. The implementation of N3 and LSeries flags have also been changed to provide consistent moment decorations and provide configurable protection against missing moments. The EC4 property has also been renamed to use C3, which is what analyzers care about. Additionally, a typo in the definition of M2 has been corrected. A few unnecessary namespace directives are also removed.

Tagging @cdelitzs, @sschramm, @cyoung, and @khoo for feedback.

Edited by Jason Robert Veatch

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