Bump LMS to 7.7.4
Fix execution flag on scripts
Bug 18045 - show additional playlist buttons in search results

Need to read the allLinks cookie in xmlbrowser.html, too, as sometimes
we don't load the header.
Merge branch 'public/7.7' into public/7.8

Change-Id: I017d872949483e7433ca459ce3d8e256a9d9fa1a