Render altformavail at the component level

[marlo-longley]

Currently we only display this at the collection level.
We have it indexed but not displayed at the moment.

Add an add_component_field line to the catalog controller.

This ticket is broken out from #898

[gwiedeman]

Added to fixtures at http://localhost:3000/catalog/umich-bhl-851981aspace_7a47b946a5107eb56d93ef0cd069d568

[marlo-longley]

I see that this was added to the fixture data in #1466 :
https://media.dlib.indiana.edu/media_objects/pv63gh62z

It is being indexed, and when I search this string, I do have a hit and am taken to a component.
However, the component does not display the link.
I'll look into this a little further

[gwiedeman]

Maybe it should be encoded differently in the fixtures as a link now that #1449 has been addressed?

[gwiedeman]

This is actually the same suffix issue as <odd>. I'll put in a PR to fix the rest.