* New version for new year, bumped default copyright notice.
* Added new funciton getDirectoryImage($root, $bThmb=false)
	* Retrieves a random image from directory $root
	* if $bThmb==true, returns a link to the thumb instead of file name
* Global $dir_nav['icon'] is no longer boolean; a value of 2 is now supported
	* When set to 2, subdirLinks will display a random thumbnail when
		there are only subdirectories, and no images