Release 2.5.0.


Add an option -I to completely skip (remove) subparts -- no headers, no body,
nothing.


Extend options -eIi to multipart subparts.


Never touch multipart/encrypted and multipart/signed.


Add an option to convert dates to the current locale and timezone.


Allow -d and -p accept shell-like patterns and/or regular expressions:
-d content-*,-content-*-encoding


Add option --save-as='%format' to generate names for --save-* files. Develop
a DSL to conditionally use values from headers and parameters.