revset: add `predecessor` aliases for `precursors` and `allprecursors`
Per https://www.mercurial-scm.org/wiki/CEDVocabulary
. $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
}