Add support of branches in fBranchCount
Add support of branches in fBranchCount

In such case we need to read in addition counter itself before branch.
Such counter read into target object with name like "counterXYZ".
This perfectly matches to scheme with normal class member reading
root-project/jsroot,bellenot/jsroot,bellenot/jsroot,linev/jsroot,bellenot/jsroot,root-project/jsroot,linev/jsroot