debugobsconvert: make sure obsstore is loaded before version comparison
hg 44918682093f delays loading obsstore, so we have to access _all to get
the correct store version.
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