Pan Update

Gee yet another new snapshot.

• server removal
• server test is, I think, complete

TODO:

• group test
• vserver test
• article test
• connect threading to import (trivial)
• add folder removal

Things to be decided by the Pan developers:

• are my changes to acache OK?
• are my changes to message-identifier OK?
• change decode to work with new setup.
• method to add extra headers to article, sometime after 1st working db version is released.
• I've forgotten the rest.