TitledSeparator shows no separator on linux

[laeubi]

This is how the example snippet looks on linux:

the examples page say it should look like this:

[wimjongman]

This is a different behavior of SWT.

I think we can add SWT.SHADOW_OUT to get the desired effect on all platforms.

	/**
	 * Create a separator
	 */
	private void createSeparator() {
		final Label separator = new Label(this, SWT.SEPARATOR | SWT.HORIZONTAL | SWT.SHADOW_OUT);
		separator.setLayoutData(new GridData(GridData.FILL, GridData.CENTER, true, false));
		separator.setBackground(getBackground());
	}