def to=(location)
      if location.nil? then raise ArgumentError.new("Specimen cannot be moved to an empty location") end
      self.to_container = location.container
      self.to_row = location.row
      self.to_column = location.column
    end
def to=(location)
      if location.nil? then raise ArgumentError.new("Specimen cannot be moved to an empty location") end
      self.to_container = location.container
      self.to_row = location.row
      self.to_column = location.column
    end
Sets the to Location.