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EXOT27 add additional variables to TruthTau container output

Philipp Gadow requested to merge pgadow/athena:21.2-EXOT27_addtruth-2021-01-27 into 21.2

This MR affects the EXOT27 derivation in the DerivationFramework.

Tau CP tools in AnalysisTop require the presence of additional variables in the TruthTaus container. The TruthTaus, which was part of the output also previously, has been promoted to the AllVariables list of containers in the slimming helper. As a result, all variables for the TruthTaus are now written out.

The size of data derivations is not affected. The size of MC derivations is expected to grow by a negligible amount because of this change.

It was tested with the mc16 EXOT27 ART file that the changes introduced in this MR increases the size by

(MC ART file after MR / MC ART file before MR) = 1.0075991933548585.

Note: the other changes in the diff only result from my linter adding spaces after commas, the only true change is adding the TruthTaus to the list of EXOT27AllVariables.

tagging @guescini for review by the Exotics Derivation Contacts, @jburr for the EXOT27 derivation and @susinha who reported the issue initially.

Edited by Philipp Gadow

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