buffer: fix multi-key sequence handling
prepare 0.15.4
issue-233: remove the lockfile if sup isn't already launched
Fix indentation
Message + false
false alone has no effect, use return with
mbox: remove sup-sync-back-mbox
Fix attachment filename handling

Attachment#write_to_disk created its temporary file with a shell-escaped name.
Passing the path to this file to write_to_disk's block parameter and returning
it created a double-escape problem, which rendered attachments with e.g. spaces
in the filename unusable.

Fixed by removing the use of the original filename from the tempfile name. Also
removed the warnings about shell escaping the temporary file name.
Fix attachment filename handling

Attachment#write_to_disk created its temporary file with a shell-escaped name.
Passing the path to this file to write_to_disk's block parameter and returning
it created a double-escape problem, which rendered attachments with e.g. spaces
in the filename unusable.

Fixed by removing the use of the original filename from the tempfile name. Also
removed the warnings about shell escaping the temporary file name.
Merge branch 'lock-234' into running
Merge branch 'rm-mbox-sync-back' into develop
view attachment fnames: history
Merge branch 'develop' into running