def read_user
      USER_CONFS.each { |ucf|
        if ucf.file? and ucf.readable?
          read ucf
          return
        end
      }
    end
def read_user
      USER_CONFS.each { |ucf|
        if ucf.file? and ucf.readable?
          read ucf
          return
        end
      }
    end
(Re)read the user prefs, if it exists.

 @return [void]