Add support for ISISDATA web service

[chbrandt]

Currently, the container relies on local ISISDATA (https://github.com/USGS-Astrogeology/ISIS3#the-isis-data-area).

Implement support (seeminless) for ISISDATA Web Service (https://github.com/USGS-Astrogeology/ISIS3#isis-spice-web-service) whenever a local copy is not provided.