Adds GCMD keywords, CF standard names to tag list
Adds GCMD keywords, CF standard names to tag list

Adds GCMD keywords and CF standard names to the package list, if they
are present.  Clicking on one of the aforementioned terms will link to a
search for the term.  Creates relevant headers for each section as well as one
with "Freeform Tags" for CKAN's freetext tags.

ioos/catalog-ckan,ioos/catalog-ckan,ioos/catalog-ckan