Fix Bug 572 (2nd time): GLCanvas.validateGLDrawable() @ display() and reshape() ; GLCanvas.reshape() only if drawble valid ; GLCanvas.validateGLDrawable() also test isDisplayable() ; Fix size validation ; resizeOffscreenDrawable(..) don't validate 'safe' size 1x1

- GLCanvas.validateGLDrawable() @ display() and reshape()
  To help users using GLCanvas w/ having a realized GLCanvas/Drawable,
  validateGLDrawable() is also called at reshape().
  This shall ensure a valid drawable after even a non AWT-EDT issued first setVisible().

- GLCanvas.reshape() only if drawble valid
  Otherwise offscreen reshape attempts would happen even on unrealized drawable,
  which is not necessary.

- GLCanvas.validateGLDrawable() also test isDisplayable()
  To make sure the native peer is valid, also test isDisplayable()

- Fix size validation
  Since we have experienced odd size like 0 x -41
  test each component, i.e. 0 < width && 0 < height.
  This is done through all JOGL/NEWT components.

- resizeOffscreenDrawable(..) don't validate 'safe' size 1x1
  In case method is called w/ odd size, i.e. 0 x -41,
  the safe size 1x1 is used. However, we cannot validate this size.
  Dump WARNING if odd size is detected.

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