Pan Update

Here's a new snapshot. This one contains a lot of changes.

• more filters updates.
• converted the following to GObject:
• StatusItem
• Task
• TaskBodies
• TaskCancel
• TaskGroupCount
• TaskGrouplist
• TaskHeaders
• TaskPost
• TaskSave
  
• Rule
• RuleAction
  
• changes to acache API.
• added group_get_group_by_name.
• article_delete_by_msg_id.
• articles_set_old.
• group_get_servers.
• folder_{add,remove}_message.
• add explicit group to filters & rule.
• a few other things I've forgotten
  

As you can see I've been rather busy. The Task stuff still needs a lot of work done by someone who knows more about the networking code. I'll probably take a break from this since I'm not sure what to do next.

Rev. 205