messages: standardize on "working copy is now at" including "is"
It seemed that we mostly used "is", but `hg next` and `hg prune` could
print it without the "is".
. $TESTDIR/testlib/common.sh
cat >> $HGRCPATH <<EOF
[ui]
interactive = true
[phases]
publish=False
[extensions]
evolve =
[experimental]
evolution.effect-flags = yes
EOF
sync() {
hg pull -R $TESTTMP/server . -q
}