No longer pick from arrays.

Per the wailing and gnashing of teeth in response to 7e51d4c and 7bb7ee2,
I'll do the extra legwork to keep my bits in a List despite java handing
them to me as an array.

src/main/java/com/samskivert/util/Randoms.java

@@ -176,18 +176,6 @@ public class Randoms
         return pickPluck(iterable, ifEmpty, false);
     }
 
-    /**
-     * Pick a random element from the specified array, or return <code>ifEmpty</code>
-     * if it is empty.
-     *
-     * @throws NullPointerException if the array is null.
-     */
-    public <T> T pick (T[] array, T ifEmpty)
-    {
-        int size = array.length;
-        return (size == 0) ? ifEmpty : array[_r.nextInt(size)];
-    }
-
     /**
      * Pick a random <em>key</em> from the specified mapping of weight values, or return
      * <code>ifEmpty</code> if no mapping has a weight greater than <code>0</code>. Each