Fix logging setup _ Silence message about missing SLF4J implementation _ Route java.util.logging to Log4J (at least restlet is affected) _ Let messages of additional loggers pass to the root loggers appender (otherwise, they don't appear at all)

SYMBOLSET
SYMBOL
  NAME 'point'
  TYPE ELLIPSE
  POINTS
    1 1
  END
  FILLED TRUE
END
SYMBOL
  NAME "square"
  TYPE VECTOR
  POINTS
    0 0
    0 1
    1 1
    1 0
    0 0
  END
  FILLED TRUE
END
END