Host macros from Glpi to deal with host location

Used by the Shinken Worldmap WebUI module
WebUI, add Worldmap in header menu
WebUI system view : typos and links
WebUI : hosts group view
WebUI : typos
WebUI Worldmap page to locate hosts on a map
WebUI, element view improvements ...

... still some details to be refined :-)
WebUI, forgotten files in previous commit !