URL-parsing+rendering part of the first two new convops ready

### Description
This PR implements the parsing of URL plus the rendering in XML and JSON of the two first of the batch of new convenience operations.
What is missing is the mongo part (see '#if 0' in serviceRoutines).

Payload format has been re-defined. Thus, probably the originally defined types needs some adaptation. I'd suggest to ask to Ana the mocks she is using (equivalente to ours .test harness, more or less) and have a look to them.