code: public EnvVars overrideAll(Map<String,String> all) {
          for (Map.Entry<String, String> e : all.entrySet()) {
              override(e.getKey(),e.getValue());
          }
          return this;
      }
docs: Overrides all values in the map by the given map.
  See {@link #override(String, String)}.
  @return this