Adds tests to test domain slicing over complex coverages
Extends CTDPF test
Coverage Handler improvement to use newer API

Fixes the coverage handler for PyDAP to use the newer retrieval API in
the coverage model for retrieving the temporal parameter.
add driver egg name read only aparam
Merge pull request #1387 from lukecampbell/ctdpf-rebase

OOIION-1336 ERDDAP - updates the PyDAP Coverage Model Handler to use smarter retrieval API
Merge pull request #1389 from edwardhunter/dvr_name_aparam_rebase

OOIION-1329   Expose the driver version information to the user via an instrument agent parameter