Start to fix sidebar buffy modifications.

Start to fix sidebar buffy modifications.

The extended buffy for mh had incorrect placement of the loop
brackets.  The counters weren't being incremented in the loop.

Fix extended buffy for maildir to count a maildir message as new if it
doesn't have the info delimeter.

Remove shortcircuits added to the basic buffy stating there is new
mail when (msg_unread > 0).  This is not necessarily true, depending
on $mail_check_recent.

Note: the extended buffy still needs more fixes, which will be done
when it is refactored into its own option.