Show relative dates in report information
Note known bug with selections in Firefox
Fix accidental closing of threads
Add (commented out) multi_delete function

This turns out not to be very useful, but worth keeping in case it gains a use
case later.
Hide unwanted warning checkboxes on infraction pages and auto-tick warnings by default
Fix incorrect whitespace in give_custom_infraction
Add links to warn/infract users for contestment
Show images in report resolution buttons
Make it harder to accidentally infract the author of a report
Fix accidentally reopening closed threads
Reopen threads when taking them
Option to select all posts after the reported post in a thread
Add get_vbcode_html_newthread()
Switch between normal and preview mode in moderate.php
Fix a display issue with notes on report pages
Add request_receipt option to send_pm()
Add ban_user function
Rewrite "notification" (now "user action") section for usability and bans

The previous design made it too easily to accidentally issue an infraction instead of a warning,
and had no facility to ban users when giving them an infraction.

This commit also pushes the user more strongly to log in to ModCP and keeps them logged in
(so bans can happen), gets up to 50 recent warnings/infractions and fixes an
issue with ModCP pages changing ID values.  These could have been split into
multiple, commits, but it was easier this way and I don't expect it would have
actually helped anything.
Updated version number to 3.6

Actual command: ./release.sh 3.6