Fixed a bug where the editor would exit because of a boost exception when browsing to a directory that the user does not have access to. The vfs now catches the boost exception and throws a FIFE exception. Updated the filebrowser to catch the exception and display a warning to the user. fixes[t:413]

<Panel title="Select an option">
	<VBox>
		<ScrollArea min_size="150,300">
			<ListBox name="optionDrop"/>	
		</ScrollArea>
		<HBox>
			<Button name="okButton" text="OK"/>
			<Button name="cancelButton" text="Cancel"/>
		</HBox>
	</VBox>
</Panel>