New team in ESS / MSS calendar

Once more a small post on an easy modification of  the ESS / MSS  standard. This  one  works  for all versions of the ESS / MSS (WebDynpro Java, WebDynpro ABAP, UI5...) and allows the addition of specific teams / population to the ESS / MSS calendars in a standard way (i.e. no reparation).