Description:
------------
It would be nice to important an entire namespace into global space, but only for 
a controlled section of code

Test script:
---------------
/* desktop.php */
<?php

namespace desktop;

class Window{...}
class Icon{...}
class Button{...}

?>

/* index.php */
<?php

require 'desktop.php';

global_function();

{
  use desktop;

  $window1=new Window();
  $window2=new Window();
  $button1=new Button();
}

more_global_functions();

?>

Expected result:
----------------
Whilst in the codeblock the namespace is available as if it were global, but once 
outside it is no longer globally available. The global namespace should be 
unaffected afterwards

Actual result:
--------------
currently namespaces cannot be imported entirely under the justification that it 
will pollute the global namespace. I believe that if only done for controlled 
regions of code this can be avoided & code can be more cleanly written