stablerange: introduce ondisk caching through sqlite
There is many short cut and limitation with this first version of a cache but
this allow use to envision some actual usage of the stablerange thingy so let us
got for it.
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