checkheads-tests: add missing parents recording for prune markers
It is a bit too easy to forget about theses :/ If they are missing, the
markers are not going to be exchanged on push.
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