Implemented delete button for annotations.
Support direct linking to highlights ID.
Use outer dimensions of display wrapper for scroller.

We want to exactly show in the scroller what is visible in the available
viewport space.
Show only those annotations which have a corresponding highlight visible.
Merge branch 'new-annotations4' of https://github.com/peerlibrary/peerlibrary into new-annotations4-editor

Conflicts:
	client/publication.coffee