Advanced manifest viewer+validator

We could offer a "Give us any manifest" and feed into this

https://github.com/thehabes/manifestTest

but rewrite that for RERUM objects AND/OR we could send a ping for validation to

http://iiif.io/api/presentation/validator/service

to see if your RERUM manifest is IIIF compliant.

This could be a page where we offer many validators to validate the RERUM manifest.