loading for the moment only implemented in libraries.js
fix ticket #3146 duplicate property name
fix half of ticket #3106 Allow only not linked icons when adding an icon
in a library
fix ticket #3106 Allow only not linked icons when adding an icon in a
library
Merge branch 'addLoadingSpinner'

Conflicts:
	src/main/java/lu/hitec/pssu/melm/services/MELMServiceImpl.java
	src/main/webapp/WEB-INF/jsp/addLibraryIcon.jsp
	src/main/webapp/WEB-INF/jsp/updateLibraryIcon.jsp