Bug 14608: Add a page to configure shared statistics

Bug 14608: Add a page to configure shared statistics

This patch set adds:
- a reference to Hea at the end of the installation process
- a link to the new page from the admin home page
- a new page to easily configure shared statistics

Signed-off-by: Mark Tompsett <mtompset@hotmail.com>
Signed-off-by: Chris Cormack <chrisc@catalyst.net.nz>
Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Brendan A Gallagher <brendan@bywatersolutions.com>
(cherry picked from commit 3d46c0c7bb8ce487f85cd0d0233cb7ceffcbbde3)
Signed-off-by: Julian Maurice <julian.maurice@biblibre.com>