[io] Extend flexibility of array size I/O marker #20070
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Fixes https://its.cern.ch/jira/browse/ROOT-5144
Not yet working:
reproducer in the JIRA link fails. Extra things might be needed with DOLOOP.
root -l -b -e 'gInterpreter->GenerateDictionary("myclass","myheader.h");' -e 'myclass mc;
mc.n = 1;
mc.MyArray = new float[3]{2,3,4};
TTree t("t", "t");
t.Branch("mc", &mc);
t.Fill();'
Add docu to release notes or TTree
Add ctest