[PATCH 0 of 6] Evolve support patches from Sean

[Andrew Shadura]

Hello everyone,

I'm submitting the some of the patches Sean Farley wrote a while ago to 
support changeset obsoletion and evolution. I've been using them for a 
while and they don't seem to break stuff. There were more patches, but 
some of them didn't work always right and also seem obsolete with the 
latest versions of Mercurial.

-- 
Cheers,
  Andrew