evolve: prompt user to select destination for stabilization in case of split
This patch adds functionality to prompt user to select a revision when there
exists multiple stabilization destination because of split on multiple branches.
Test are also added for the feature.
I am not sure whether this is the best message which we can show, if people have
suggestions I will like to improve the messages shown in prompt.
#require test-repo pyflakes
Copied from Mercurial core (60ee2593a270)
$ cd "`dirname "$TESTDIR"`"
run pyflakes on all tracked files ending in .py or without a file ending
(skipping binary file random-seed)
$ hg locate 'set:(**.py or grep("^#!.*python")) - removed()' 2>/dev/null \
> | xargs pyflakes 2>/dev/null