Log Message:
Update to 1.21:

1.21 Wed Sep 28 2005
	- Documenting ->autouse(@classes)
	- Tidying up the POD a little to refer to features
	  in an order much more relevant to the reader.

1.20 Tue Aug 18 2005
	- Catch and rethrow all error when autoloading during a ->can.
	- Debugging can now only be done at compile time, and thus is
	  optimised out. The :debug flag is removed and instead you need
	  to preset $Class::Autouse::DEBUG.
	  Given that this was only for my benefit in the first place, it's
	  not appropriate to slow down everything else because of it.

1.18 Tue Jul 26 2005
	- Added :nostat module to disable the initial stat checks
	  of modules.