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fix(ir.attachment.facturae.mx): search for XML total only as attribute from cfdi:Comprobante element

When XML contains addendums it's possible that attribute total exist in other elements than the

cfdi:Comprobante; in those cases the XML validations could be problematic. This change restrict

function _parse_xml to read for total only as an attribute of cfdi:Comprobante element ignoring

addendums.

It's possible that in certain circunstances we need to read UUID from XML file without create a

ir.attachment.facturae.mx objetct: for example when the UUID there is already on database and we

want to get the record ID, in that situations, we need to get the UUID from file to be able to look

for it on database. Proposed solution for that situations is allow _parse_xml function to be

provided with a XML file content to parse. Maybe in the long term this change is not going to be

needed anymore when we implement the CFDI download from SAT.