obshistory: display a message when one marker node has no change ctx
When exchanging obs markers, there is some change contexts
referencing change contexts that are not available locally.
As we cannot display informations about them, instead print a
message saying so.
all: tutorials/tutorial.rst static/logo-evolve.ico
sphinx-build . ../html/
tutorials/tutorial.rst: tutorials/tutorial.t
python test2rst.py tutorials/
static/logo-evolve.ico: static/logo-evolve.svg
convert -resize 36x36 static/logo-evolve.svg static/logo-evolve.ico