evolve: rename handlenotrouble to _handlenotrouble and add doc
As suggested by Pierre-Yves on his comments on
f113636997660b807c36cf1d0a06b76d53ada1a4 we make it clear that this function
is private and explain what it does.
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