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Allow postProcessIDPVMHistos to be invoked with a "hadd-like" signature.

Maximilian Emanuel Goblirsch-Kolb requested to merge goblirsc/athena:IDPVM_merge_haddLike into master

This MR makes it possible to call postProcessIDPVMHistos with a signature like ROOT's hadd utility: postProcessIDPVMHistos -f <output file> <input file>. This is needed to allow the program to fit seamlessly into the PhysVal merging infrastructure, which seemingly expects to call programs with <Program> -f <output> <input>.

In this new invocation, the original file is not modified, but a copy is created and then post-processed in the same way the original signature would.

Adding @jferrand @miochoa @schsu @mamolla for PhysVal and @sroe for IDPVM + @vcairo for tracking CP.

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