command-line options.
-WHAT'S NEW in version 2.5.0 (2014-03-??)
+WHAT'S NEW in version 2.5.0 (2014-03-18)
Add option --set-header=header:value to set header's value (only at the top
level).
Add option -O to set the destination directory for output files.
- Create the directory for the output files (-O) if it doesn't exits.
-
Fix a minor bug: if a multipart message (or a subpart) lacks any textual
content - avoid putting an excessive newline.