Fix layout of publishing dialogue
'event' was not defined
We should be using `home` not `root` to refer to a site's homepage
Add explicit test of content hash change when re-ordering pages
Prevent hover from shrinking the gap between entries
PagePieces should return the same hash when asked for a calculated
version

This discrepency was why the hashes calculated during the db migration
and the hashes calculated by the CMS backend were different.
Re-ordering shouldn't open edit pane or navigate to page