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.
. $TESTDIR/testlib/pythonpath.sh
cat >> $HGRCPATH << EOF
[extensions]
docgraph=
EOF