code: @SuppressWarnings("unchecked")
      public Collection<EsaResource> getAllFeatures() throws RepositoryBackendException {
          return (Collection<EsaResource>) getAllResources(ResourceType.FEATURE);
      }
docs: This methods returns a list of all features in the supplied repositories
  
  @return A list of resources representing the features in the repositories.
  @throws RepositoryBackendException