Use <i>Everything</i> instead of [SELECT ALL] in filterchanges.py

Fits better with other similar pages in Critic.
Close "Edit Summary" dialog on ENTER
Set "Add Reviewer/Watcher" dialog height to "fit to content"

It was showing scrollbars by default in all browsers.
Delete commented out code + unused function it referenced
Make "Edit Recipients" dialog slightly wider

In chromium the last chars of the text in the Mode: dropdown
was hidden by default until the dialog was resized.