DSC-860 Tooltips

Added tooltips to thumbs and Sensitive image Glyphicons.

To achieve this I had to move the link to jQuery to layoutheader.ftl - as leaving it in layoutfooter.ftl does not allow it to work.

This may enable other jQuery effects that were previously broken....

Signed-off-by: mossrocket <peter@mossrocket.com>
Merge pull request #858 from nla/DSC-860-tooltips

DSC-860 Tooltips