Add services providing statistics about search and catalog content (return XML response). Enable stats by default.
Refactoring / Give a name to new module.
Merge branch 'improvement/statistics/add-search-and-content-xml-services' of git://github.com/fxprunayre/core-geonetwork into fxprunayre-improvement/statistics/add-search-and-content-xml-services

Conflicts:
	web/src/main/webapp/WEB-INF/classes/setup/sql/data/data-db-default.sql
Merge branch 'fxprunayre-improvement/statistics/add-search-and-content-xml-services' into develop