exclude AnonymousUser from autocomplete fixes #1653
Wrap tabs in a block in the base template

This allows to modify the tabs without having to modify all the header.
It's typically useful in a geonode-projects to add a new tab before or
after the existing tabs by redefining the block and calling block.super
don't trigger the save on popular_count update, fixes #1631
Merge pull request #1698 from loganalysis/extra_tabs

Wrap tabs in a block in the base template