Clarify untracked file merge message

Remove references to documentation that was removed in da9506fe2710

Corrected documentation for return value of python hooks.

Fixed directory name having an extra dot on "hg archive -t tbz2 foo.tbz2". Problem reported by Rob Landley.

Try hgweb unbundle methods in the order presented by the server. If no common bundle format is found, push is aborted.

Client support for hgweb unbundle with versions.

Add allowed bundle types as argument to hgweb unbundle capability. Arguments to capabilities were added before the 0.9.1 release, so there are no compatibility issues. Mercurial 0.9 didn't support http push. Using HG10GZ, HG10BZ and HG10UN has the advantage that new bundle types can be added later and the client doesn't have to try sending them first and reacting on errors sent by the server.

hgweb: remove debugging print

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)

hgweb: if the server supports it, send a compressed bundle