SONAR-5634 - Implemented facets as sticky (multi-select) facets for RuleIndex

Conflicts:
	server/sonar-server/src/main/java/org/sonar/server/rule/index/RuleIndex.java
	server/sonar-server/src/main/java/org/sonar/server/search/Result.java
SONAR-5535 refine layout of size widget (generated_sloc under sloc)
SONAR-5535 Fix widget path
Fix loading of settings tabs