class file_mime_body :
?fin:bool -> string ->
mime_bodywhere the value is stored in an external file.
The argument is the name of the file containing the (decoded) value.
value loads the contents of the file and returns them
Example: To create a body from the file "f", call
new file_mime_body "f"
fin: whether to delete the file when the
finalizemethod is called (default: false)