TnyAccountTreeModel now uses the new TnyFolderStoreIface API

[Philip Van Hoof <spam pvanhoof be>]

TnyAccountTreeModel now uses the new TnyFolderStoreIface API

because now reference counting is more correct I however found a bug.

If you open a folder, switch offline/online, and then reopen the folder
and click a message .. a crash in camel happens IF you use the mmap
patch. Else the crash doesn't happen.

I will soon figure out what that is. It's something with the summary
being unmapped yet instances of it still being used.

-- 
Philip Van Hoof, software developer at x-tend 
home: me at pvanhoof dot be 
gnome: pvanhoof at gnome dot org 
work: vanhoof at x-tend dot be 
http://www.pvanhoof.be - http://www.x-tend.be