Visualize the search field only from the pages where it has effect

[albertocottica]

I find the use of the search field quite confusing. At the moment I cannot get it to have any effect, but then I think it's not supposed to work on some of the tabs.

[jason-vallet]

The content of the search field is now customised depending of the current view. The number of suggestion has also been increased to 20 and different behaviour are proposed:

• Conversation: all values, validation return the information panel concerning the searched element.
• DOI: all values, validation compute a new graph using the selected element as a focus
• Tag view: only tags, validation refocuses the view on the element
• Tag view full: in transition while waiting for #20 , only tags and return the information panel.
• Settings/About: disabled.