[SNMP4J] Logging

[Mathias Bogaert]

* Changed: Due to incomplete state of Log4J 1.3-alpha6 and
   for the sake of a more flexible logging interface the
   new package org.snmp4j.log has been introduced. By default
   SNMP4J does not use logging. To enable logging, for example
   Log4J logging which is supported out-of-the-box, use
   "static { LogFactory.setLogFactory(new Log4LogFactory());}"


Sigh...another 'commons logging' effort....why oh why? We *could* just 
stick with log4j 1.2.9 or something...

Mathias