+ Add option --set-header=header:value to set header's value (only at the top
+level).
+
+ Add option --set-param=header:param=value to set header parameter's value
+(only at the top level). The header must exist.
+
+ Add option -B to skip content-transfer-decoding binary attachments.
+
+ Add options --save-headers, --save-body and --save-message to save decoded
+headers/bodies/messages to files.
+
+ Add option -O to set the destination directory for output files.
+
+ Fix a minor bug: if a multipart message (or a subpart) lacks any textual
+content - avoid putting an excessive newline.