-Change option -R to accept lists of headers and parameters:
--R h1,h2,h3:p1,p2,p3
-Allow * and exceptions:
--R h1,h2,h3:*,-p1,-p2,-p3
--R *,-h1,-h2,-h3:p1,p2,p3
--R *,-h1,-h2,-h3:*,-p1,-p2,-p3
+Split mimedecode.py into a library and a small script.
+Move formatparam_27.py and mimedecode_version.py to the library.
+Rename mimedecode_version.py to __version__.py.