CKAN-wide issue search page

[davidread]

We have pages for dataset issues, organization issues, and now we want to also have 'all issues'. A page for sysadmins and other interested members of the public. Allows you to get a sense of how many issues, what sorts (tags) are popular etc. Otherwise they are effectively siloed.

Maybe could be combined with the organization issues page, with the org being a facet.

[rufuspollock]

I think this would be useful but perhaps for something post version 1? What do you think?