stablerange: fix merge slicing when range has multiple roots
The first element in the bottom set is not necessarly the one with the lowest
revision. We now properly compute and use the minimum value.
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