Mailgraph plugin:  Update according new plugin API (0.2.3)
Mailman plugin: Update according new plugin API (0.2.3)
Monitorix plugin: Update according new plugin API (0.2.3)
POP3Fetchmail plugin: Update according new plugin API (0.2.3)
RoundcubePlugins plugin: Update according new plugin API (0.2.3)
SpamAssassin plugin: Update according new plugin API (0.2.3)