Fixes for v1.7 release

[rgrp]

A place to list crucial fixes for v1.7 release:

• Related Item has comments on index page (they should not show up here -- why is this happening!)
• Related item should be to left of history (history could in fact move to RHS)
  • What about losing icons since we duplicate for related item
• Related item plus sign is very poorly aligned within box
  • Add related items should be in drop down like for resources (?) to make it easy to add items
  • Hover should show a title that gives some information about what related are (not at all clear)

Search results:

• #2231 - search should add not or
• Search results should be similar across group pages and normal search results (suggest adopting group page style)
  • Search results resource link should link to resource page rather than url for that resource
  • Suggest we could tidy this a bit (e.g. have resources in mini-sidebar of search result ...?)

Data viewer:

• Do not show failed preview with red-bar (esp when just empty datastore ...)
• (? not really a fix) Give out a link as well as embed instructions (I often want to link to the explorer in a given state)
  • Should this link to the resource page or to a dedicated viewer page - cf # 2322 (resource sub-urls like /download, /api ...)
  • Do #2322 ...

Dataset page:

• Put home page link somewhere more prominent (e.g. the top of the sidebar)
• Make resources stand out more
• Rename resources tab and heading to Data & Resources