added new mail retrieval subsystemm

docs/changelog/6.x.x.txt

@@ -32,6 +32,7 @@
    everything should cache in the same way.
  - Converted WebGUI to use a new object oriented session system. More details
    in migation.txt.
+ - Added an API for retrieving email from POP3 servers.
  - Added a lot more tests to the test suite.
  - Added a new pluggable templating system. (Thanks to Misja Op de Coul /
    E-Wise)

docs/gotcha.txt

@@ -40,6 +40,8 @@ save you many hours of grief.
 	POE::Component::IKC::Server
 	POE::Component::Client::UserAgent
 	Net::Subnets
+	DateTime::Format::Mail
+	Net::POP3
 
  * The upgrade script is going to convert your WebGUI config files
 	from the current PlainConfig format to the new JSON format.