add a message list page and a batch ajax callback option
convert mailbox views and unread to the message list page setup
split the page cache into session only and persistant between sessions
misc fixes, re-enabled limited persistant page cache
cache fixes, other misc imap improvements
make the imap message part arg optional for the fetch headers method
style updates to the core module
add headers and pretty displaying of message text previews
style and message list page updates
message list paging support. other misc fixes