Fix automatic decompression of tarballs with Firefox.
The encoding was set to gzip/bzip2, so Firefox (correctly) assumed, that this
has to be "decoded" (i.e. decompressed).
port:4:export
port:4:vaportight
port:4:import/export
FIXME: history is wrong here
port:1:1:-:eggs:import
port:1:2:+:eggs:vaportight
port:1:3:+:eggs:import/export
port:0:2:+:spam:export
port:0:1:+:spam:import
port:4:import/export