py2-only ports providing py-* modules that are no longer used in ports.
this doesn't change ports used to support standalone py2-only applications,
not currently planned to remove those at least until a few things with no
real alternatives get ported to py3.
Python module for writing pandoc filters. Pandoc filters are pipes that
read a JSON serialization of the Pandoc AST from stdin, transform it in
some way, and write it to stdout.
