evolve: remove not required calls to phases.retractboundary()
To make sure phases are preserved during evolve, we started using the
phases.new-commit config option. Now we don't need to call
phases.retractboundary(). Let's remove the redundant code.
Doc is generated with sphinx.You can generate the doc with:```make```# TutorialsFor 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 ifneeded.You'll need the dot binary (likely installed by the graphviz package in yourpackage 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 ofthe tutorial .t files into .rst files. Then sphinx should do the rest of thejobs by rendering graphviz graphs.