obslog: redefine default output as a template, unless -f was given
This was easier than I expected to do without affecting any test
output at all.
`hg obslog -f` is pretty broken with templating. For example, it
inserts a single "date" field, but it provides two values for it if
the dates are different. That results in a traceback when running
e.g. `hg obslog -f -Tfoo` with non-local obsmarkers with different
dates. We need to figure out what we want to put in the template for
the filtered case. I've just left it out for now.
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.