Update the Altiga dictionary with new values

Add new attributes and values to the Altiga networks dictionary
as found in the Cisco Prime 6.0 Access Registrar User Guide.

Add historical note about Altiga's aquisition in case someone is
(still) looking for Altiga-related documentation.
Merge pull request #520 from matsimon/altiga-dict-new

Update the Altiga dictionary with new values