-pip install -r
+Never touch multipart/encrypted and multipart/signed (but allow -I).
+
+
+Convert dates to the current locale and timezone (with an option?)
+
+
+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 of headers, parameters and the counter.