[Classpathx-javamail] New implementation of loggers in GNU inetlib

[Chris Burdess]

Hi

In order to make the behaviour of javax.mail.Session.setDebug and  
setDebugOut work correctly, I have made a small API change in some of  
the inetlib clients regarding logging.

Previously, some clients had a public static Logger logger member.  
This is now instance-scoped (not static). I hope this doesn't break  
too much stuff.

Debugging GNU JavaMail should also now just work in the same way as  
Sun's implementation, although if you're a java.util.logging expert  
you can also get protocol logging to work without using setDebug, and  
of course you can still use java.util.logging in exactly the same way  
for inetlib.