Method for going to URL separate from View button

[dstillman]

View button will use a snapshot if there is one, so there should be a quick way to access the URL as well

Make the "URL" label clickable, add another little green arrow?

[dstillman]

Blocking #328, though its merit is up for debate

[dstillman]

(In [1166]) Addresses #329, Method for going to URL separate from View button

URL label is now clickable -- has cursor feedback on hover but still needs a visual indicator of some sort

Other changes:

• Can now load snapshots and pages in new tab/window by using the standard Firefox modifier keys while clicking the View button or the URL field
• View button in metadata pane now displays "View" or "View Snapshot" as appropriate
• Better detection of invalid snapshots when deciding whether to use "View" or "View Snapshot"
• Non-HTML snapshots viewed via the View button are loaded using the standard attachment logic rather than just window.loadURI()
• Added green Go arrows to standalone attachment view/show buttons

Method changes:

• ZoteroPane.loadURI(uri, event, data) - (new) Load URI with standard Firefox mod key support; passing an object with 'attachmentID' property triggers annotation mode
• ZoteroPane.viewAttachment(attachmentID, event) - (new)
• ZoteroPane.viewSelectedAttachment(event) - Now takes event param
• Zotero_Browser.annotateThisPage(id) changed to annotatePage(id, [browser]) to handle background tab loading

[dstillman]

Still needs visual indicator

[simon]

We have "View Online" under the locate menu.