Compressed ewk xsec files, for completeness

Merged Julia Lynne Gonski requested to merge jgonski/athena:dev-compressed-ewk into 21.2

As discussed in Wednesday's compressed ewk weekly meeting, I'm creating this MR for the four xsec files I've been adding by hand to SUSYTools for our analysis. These may or may not already be added to the central PMG database... tagging @miholzbo who handled xsec migration initially for the group, so he can look through these and see if there's anything here that wasn't added to the central database.

@oabouzei, @ykeisuke, @jmiguens, @szambito: thanks everyone!

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