PowhegControl: documentation of bb4l-dl integration grid creation

Katharina Vossrequested to merge
katharin/athena:bb4l-dl-int-doc into main

Documentation of generation of the nominal Powheg bb4l-dl integration grids including helper scripts for setting up the generation and checking the results. These scripts are not run within Athena, they are added only for documentation purposes.

Edited by Katharina Voss

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