obshashrange: do not search for affected stable range cache is unavailable
Before this changeset we where resetting in all cases, and then looking for
affected ranges. In addition is the stable range were not available, the
functions silently returned no ranges affected.
Now, do one or the other depending of the availability of the stable range
cache. In practice we always do a broad reset because the code detecting
affected changeset is currently buggy.
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.