WebMessage: fix menu and broken links

• Fixes issue with broken links on /yourmessages/display page. (closes #1487)

• Addresses issue with javascript exceptions due to moved script tags. Adds new invenio.js that loads all javascript needed for correct dynamic menu behaviour using data-menu="click" and data-menu-source="<url>" attributes in appropriate menu element.

Signed-off-by: Jiri Kuncar <jiri.kuncar@cern.ch>
Tested-by: Tibor Simko <tibor.simko@cern.ch>