• (ms) added filename() method to L4P::Appender::File as suggested
  by Lee Carmichael
  
• (ms) added RRDs appender Log::Log4perl::Appender::RRDs and testcases
  
• (ms) fixed Log::Log4perl::Appender to check if a an appender package
  has already been loaded and skip 'require' in this case.
  Packages injected via Class::Prototyped caused an error with this.
  
• (ms) Extended the FAQ's "How can I write my own appender?" on
  how to dynamically create new appenders via Class::Prototyped.