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.
% new file
applying patch from stdin
% new empty file
applying patch from stdin
empty
% chmod +x
applying patch from stdin
% copy
applying patch from stdin
a
a
% rename
applying patch from stdin
copyx
empty
new
rename
% delete
applying patch from stdin
empty
new
rename
% regular diff
applying patch from stdin
% copy and modify
applying patch from stdin
a
a
b
a
a
% rename and modify
applying patch from stdin
copy2: No such file or directory
a
a
b
c
a