hgweb: introduce a new capability for sending a compressed bundle
the header of the bundle is the same as a on-disk bundle
HG10UN: uncompressed
HG10BZ: bz2
HG10GZ: gzip
no header means uncompressed (old client)
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35fb62a3a673d5322f6274a44ba6456e5e4b3b37 0.9
2be3001847cb18a23c403439d9e7d0ace30804e9 0.9.1