Until now, the Issue Summary Table has been handling URLs with a

#comment123 hash and taking care of expanding the appropriate review

and jumping to the right place on the page. This meant that these URLs

wouldn't work if the Issue Summary Table wasn't being used on the page,

and was a bit redundant with the page view's own URL handling.
This change moves the handling of anchors fully into the review request

page's view, consolidating logic into one place and making the Issue

Summary Table fully self-contained.

Unit tests pass.
Tested URLs pointing to an issue in a collapsed entry, and saw that it

handled navigating to the right place.