[Exp PyROOT] Use addressof to retrieve the address of fields
[Exp PyROOT] Use addressof to retrieve the address of fields

In new PyROOT, when the address of a field of a struct is to
be retrieved, like in this tutorial, addressof should be
used. Its result can be passed to the Branch pythonization.
AddressOf in new PyROOT can't be used for that purpose.

In old PyROOT, AddressOf could be used for that purpose, but
its behaviour was inconsistent. AddressOf(o) returned a buffer
whose first position contained the address of object o, but
Address(o, 'field') returned a buffer whose address was the
address of the field, instead of such address being contained
in the first position of the buffer.

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