evolve: use cmdrewrite.amend() instead of creating a new commit
This patch backs out changeset 88601e1cd5d8.
We replaced cmdrewrite.amend() with creating new commit because using amend(), a
high level function was not good and creating a new commit gave us more control
over things.
**HOWEVER** to get more control, you need to get arrange all the pieces together
perfectly. Creating a new commit, the existing logic has some bugs around
dirstate handling, the `repo.dirstate.setparents()` call especially. Sometimes
this fixes the dirstate correctly sometimes not.
As Pierre-Yves David said, "Having a "clumsy" implementation with the right
behavior is usually a good first step. So having an amend based implementation
seems like a good first step.", let's take a step back and get back using amend
so that we can have a correct basic implementation which is bug free.
Doc is generated with sphinx.
You can generate the doc with:
```
make
```
# Tutorials
For updating the tutorials, you need to have the docgraph extension installed
(https://pypi.python.org/pypi/hg-docgraph).
Then run the test-topic-tutorial.t and test-tutorial.t to update the output if
needed.
You'll need the dot binary (likely installed by the graphviz package in your
package manager) in order to have graphviz graphs rendered in the html output.
Simply run make in the docs directory should takes care of the conversion of
the tutorial .t files into .rst files. Then sphinx should do the rest of the
jobs by rendering graphviz graphs.