Test of the hg evolve extension for easier upstreaming

[Arne Babenhauserheide]

Hi,

I tested the evolve extension from Pierre-Yves to see if it can help me upstream my work more easily.

-> http://draketo.de/light/english/mercurial/hg-evolve-2013-01-12

Contents: Description and code-snippets:

- Amend changesets.
- Rebase collaboratively: Rebase which does *NOT* break others repos.
- Show that it is safe.
- Split a big changeset.

(I left out the folding, because `hg fold` does not yet support
passing the new message in a non-interactive shell. But I described
it, so you can test it yourself)

Best wishes,
Arne