Task/395 pagination queries

### Description
Pagination implemented and with rudimentary unit tests.
URI params 'offset' and 'limit' used.
A third URI param 'details' steers whether 'mongo db count' command is issued on no hits.

Yeah, this was the problem I encountered.
I need to preserve the copy of the name, as it seems to be destroyed in the call to 'connection->count'.
After calling 'connection->count', the call to 'connection->query' needs (of course!) the 'colName' to be intact.