parsers: clean up whitespace

diff: pass contexts to status Allow status() to take contexts as well as nodes. This lets us avoid unpacking manifests multiple times and intelligently unpack manifests in revision order. Also, we can avoid unpacking manifests at all when there are no changes in the working directory.

revlog: fix heads performance regression

zeroconf: advertise a proper hostname for _hg services

zeroconf: use only first part of hostname for building local name

inotify: avoid status getting out of sync Always looking up oldstatus keeps us from failing to update our state when we disagree with the dirstate.

inotify: fixup rebuilding ignore