revset: add `unstable` alias for `troubled`
Per https://www.mercurial-scm.org/wiki/CEDVocabulary. The old name is still
available (but undocumented) for compatibility. `Orphan` was renamed from
`unstable` in core in 4.4, so this seems safe to do now.
# utility to setup pythonpath to point into the tested repository
export SRCDIR=`dirname $TESTDIR`
if [ -n "$PYTHONPATH" ]; then
export HGTEST_ORIG_PYTHONPATH=$PYTHONPATH
export PYTHONPATH=$SRCDIR:$PYTHONPATH
else
export PYTHONPATH=$SRCDIR
fi