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).

I write this like so:
>orionCurl --url "/info/contextEntityTypes/xxx/attr"
I think it looks better :)

NTC