DS-2108 Add an XMLUI aspect to report Google Analytics stats

Conflicts:
	dspace-api/pom.xml
DS-2108 trivial change to move a comment
DS-2108 Hopefully improved the instructions in google-analytics.cfg
DS-2108 Correct license headers
DS-2108 Give the Service Account permission to read your GA data
DS-2108 Small correction to the instructions
DS-2108 Improve the ordering method of the results
DS-2108 templates.js was interfering with google-stats-dates.js, so move the latter
DS-2108 fix conflict in Jackson dependencies
DS-2108 Move messages into main messages.xml file