New subpackages: root-roofit-common, root-roofit-dataframe-helpers,
root-roofit-hs3, root-tmva-sofie and root-tmva-sofie-parser
Removed subpackages: root-memstat and root-montecarlo-vmc
Drop the doxygen generated root-doc package (doxygen runs out of memory)
Dropped patches: 17
New patches: 22
Updated patches: 5
ROOT now uses llvm/clang version 9 (updated from version 5)
No longer exclude arch s390x (better supported in llvm/clang 9)
Drop patches accepted upstream or previously backported
Backport some fixes that make more tests work
New subpackages: python{2,3}-distrdf, root-roofit-batchcompute
Require js-jsroot >= 6
