Fix installation and usage of AnalysisTree headers (#2435)

Patch the AnalysisTree and AnalysisTreeQA build systems to create also correct dictionaries for ROOT versions below v6.18.0. Add the directories where the header files of both packages are installed to ROOT_INCLUDE_PATH which are paths used by rootcint to find needed header files.

changed milestone to %DEC21

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• 3029e9f4 - 1 commit from branch computing:master
• a2927267 - Fix installation and usage of AnalysisTree headers

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Dear @f.uhlig, @v.friese, @p.-a.loizeau,

you have been identified as code owner of at least one file which was changed with this merge request.

Please check the changes and approve them or request changes.

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