feat/bt-py3 branch (MR 1979): BusinessTemplate,XMLExportImport: support python3
With these changes, we are able to install py2 business templates on py3, but export is slightly different, because we already export using pickle protocol 3 on py3. To be able to install py2 business templates, we included heuristics to guess the str or bytes from business template XML: oids are bytes and also some strings that do not decode to UTF-8, so that we can install python2 business templates on py3. When exporting business templates, we need to build a list of referenced persistent objects to export them separately in the XML, this is is done using Unpickler.noload, in a way which does not support pickle protocol 1 on py3 (the persistent ids are None and the assertion in https://github.com/zopefoundation/ZODB/blob/d698507bb89eeb38c6e655199bc9f54c909dbf4d/src/ZODB/serialize.py#L669 fails), so we need to use pickle protocol 3 on py3. In the future, we might switch to exporting on protocol 3 on py2 as well so that we have stable output on both py2 and py3, or maybe we'll do this only when we stop supporting py2.
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