Help nits
Mail tool: 'Contact authors for Accepted papers' + specific papers.

Previously this ignored the 'Accepted papers' part and sent to the
specific papers, whatever their status. Now it intersects. Jeff Mogul
request.
Mail tool: Show a paper limitation for 'Accepted papers' when appropriate.
Mail tool: Report mail, recipient, and paper counts.

Jeff Mogul suggestion.
TODO maintenance
Help: Allow slash URLs, and generate anchors.

I wanted section anchors; John Heidemann also wanted them, long ago.
Nit: Don't nest <a> blocks when creating an account (bad HTML).
Internal: Use a helper class for CSV parsing.
Internal: Add a helper class for XLSX generation.

Requires some updates to ZipDocuments, a document helper class.
This was done for SEAS admissions.
Add ACM CMS report download option.