This patch ensures the following commands join their arguments with
spaces to make it easier to interact with:
- cf
- mkdir
- cd
- attach
- detach
- ct
- copy
- move
- save
Add a command for removing attachments from a composed message. Syntax
is :detach [path], with path being an optional argument specifying the
path of one existing attachment. If no path is specified, the first
attachment is removed.