[PSSU/Trac] #3096: Fix the generation of library icon index
Merge remote-tracking branch 'origin/list_order_01'

Conflicts:
	src/main/java/lu/hitec/pssu/melm/persistence/dao/MapElementLibraryIconDAO.java
	src/main/java/lu/hitec/pssu/melm/persistence/dao/MapElementLibraryIconDAOImpl.java
	src/main/java/lu/hitec/pssu/melm/services/MELMService.java
	src/main/java/lu/hitec/pssu/melm/services/MELMServiceImpl.java
	src/main/java/lu/hitec/pssu/melm/utils/MELMUtils.java
	src/test/java/lu/hitec/pssu/melm/services/MELMServiceImplTest.java