Fix copies reporting in log and convert.
If copy logged in file revision, we report copy for changeset only
if file revisions linkrev points back to the changeset in question
or both changeset parents contain different file revisions.
This fixes extra copies reported when executable bit was changed for
previously copied file.
#!/bin/sh
hg init a
echo a > a/a
hg --cwd a ci -Ama
hg clone a c
hg clone a b
echo b >> b/a
hg --cwd b ci -mb
echo % push should push to default when default-push not set
hg --cwd b push | sed 's/pushing to.*/pushing/'
echo % push should push to default-push when set
echo 'default-push = ../c' >> b/.hg/hgrc
hg --cwd b push | sed 's/pushing to.*/pushing/'