def to_protocol(params)
      pcl = CaTissue::CollectionProtocol.new(params)
      unless pcl.find then
        raise ScatError.new("Protocol not found: #{pcl.title}")
      end
      pcl
    end
def to_protocol(params)
      pcl = CaTissue::CollectionProtocol.new(params)
      unless pcl.find then
        raise ScatError.new("Protocol not found: #{pcl.title}")
      end
      pcl
    end
Builds the registration object specified in the given parameters.

 @param [{Symbol => String}] params the registration parameters
 @return [CaTissue::CollectionProtocolRegistration] the SCG to save