Issues on Candidate Rating page

[PaulHancock]

As noted by Sammy:

• [x] When there are no unrated candidates for a project, can the text "Choose a different project in the sessions settings page" include a link to the sessions settings page?
• [x] Mouse cursor on hover over the diagnostic plot image turn into the zoom-in icon? e.g. ...:hover {cursor: zoom-in;}
• [x] Mouse cursor on hover over the animation turn into the zoom-out icon (since that what clicking on it seems to do)? e.g. ...:hover {cursor: zoom-out;}
• [x] Similar "open link in new tab" icon on the Observation ID link?
• [x] What does the (N.B) mean next to "Rate all of this obs" checkbox? Also, why would this ever be a good thing to do?
• [x] I see that the "Sep (arcmin) ..." line in the "Nearest known source" is red. Why is that? It seems to be always red, regardless of whether the separation is small or large.
• [x] Not choosing a classification results in a Django error. It looks like each radio button is a separate HTML input element, and it looks like the surrounding "form" element is commented out. There must be a Django-y way to group the radio buttons into a group so that, as a whole, they can be set to required, and the form doesn't get sent if a selection hasn't been made.
• [x] Q: Are "notes" tied to the candidate or the rating? In other words, if I make a note, will it be seen by other users? Whatever the answer is, can this be made clear to the user?
• [x] Can all external links (e.g. SIMBAD, ATNF) open in a new tab (target=none??) by default?
• [x] Does association with a known pulsar do anything apart from changing how it appears in the ATNF pulsars list at the bottom? Like, is it supposed to stop you being able to classify it or anything?

[PaulHancock]

(N.B) means that there is a note. When a user hovers over the text they see a description of what the tick box does. This feature was requested by Natasha - I assume that it would be useful when you can see that an image has a lot of rubbish in it, and you might want to rate everything in that image as RFI.

I have modified the (N.B) to be (note) and to have an dotted underline, and a mouse hover icon of a question mark, so that the user can more easily see that this text is something to be interacted with.

[PaulHancock]

Sep arcmin is red when the nearest known source "is_close". It seems that this is always true, I can remove this feature if needed.

[PaulHancock]

Notes are stored on the candidate not the rating. Other users will be able to see/modify the notes when they rate a candidate. I have updated the title to be "Notes for this candidate (all users)" to make this more clear.

[PaulHancock]

Association with a Pulsar doesn't limit your ability to perform any other actions. It's just a flag that get set.