evolve: use flag value from core for bumped fix
This flag is available from core for a long time, lets use it directly from
there.
This commit intend to cleanup old stuff from the evolve extention.
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