Improve user tagging usability

[alondhe]

Expected behavior

A user can tag their assets (concept sets, cohorts, characterizations, IRs, pathways, etc) in batch.

Current behavior

Our initial tagging release does not have this capability. Instead, a user needs to go to each study asset they own / have write access to and tag individually. This is cumbersome, as often a study requires many assets.

Steps to development

We have begun development of this new enhancement for 2.12:

[anthonysena]

Some initial thoughts here:

• When this is implemented, the "Tagging" item on the left-hand menu item should be hidden by default and optionally enabled for those that want to use the feature.

• 

• The screenshot above is a bit confusing to me as I believe the (x) in the screenshot above refers to the tag ID and I'd actually interpret this as the # of entities with the tag. Perhaps it could be formatted as "Tag Name (ID = X)" to make it clear? Or use a hover over to show the ID when required?