Add new Filter class to change caching Add new Filter class to avoid caching of GWT nocache files in browsers and http proxies. The new Filter class NoCacheFilter sets http headers to stop the proxies and browesers from storing the nocache files.

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