evolve: add another test for evolve --rev
This patch adds one test for three conditions not covered before:
- evolve --rev on a stack with obsolete commits without successors
- evolve --rev on two sets of stacks in parallel
- evolve --rev on a set of stack partially solvable (because all of the
commits of the stack are not specified with --rev)
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