evolve: remove unused warning message in _solvedivergent Before this patch, we were checking for a case where a divergent changeset could be public and printing a warning in that case. When we compute the divergent set in the obsolete module we explicitely look for not public() changesets. This patch removes this unused warning.

compat: use svfs instead of sopener The "new" attribute is about 2 years old so let's move on.

fold: avoid using x:y in the help Suggesting "x:y" is a bad idea because x:y is a very deceptive revset.