evolve: fix progress display with hg<4.7 Since d1aab9d82f5b (evolve: adapt for deprecated ui.progress(), 2019-01-14), the "item", "units" and "total" are all set to default values. The last one is especially bad since it results in a "spinner" instead of a progress bar.

. $TESTDIR/testlib/pythonpath.sh

cat >> $HGRCPATH << EOF
[extensions]
docgraph=
EOF