bugzilla: fix transport initialization on python 2.4

bisect: set HG_NODE when runing a command When running a command, set the environment variable HG_NODE to tell the command which changeset is being visited.

bisect: track the current changeset (issue3382) Introduce a new revset feature, bisect(current), that identifies the changeset currently being bisected.

localrepo: optimize internode status calls using withflags Introduce manifestdict.withflags() to get a set of all files which have any flags set, since these are likely to be a minority. Otherwise checking .flags() for every file is a lot of dictionary lookups and is quite slow.