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.
merging baz and foo
1 files updated, 1 files merged, 0 files removed, 0 files unresolved
(branch merge, don't forget to commit)
1 files updated, 0 files merged, 1 files removed, 0 files unresolved
merging foo and baz
1 files updated, 1 files merged, 0 files removed, 0 files unresolved
(branch merge, don't forget to commit)
initializing destination new repository
scanning source...
sorting...
converting...
5 add foo bar
4 change foo
3 make bar and baz copies of foo
2 merge local copy
1 merge remote copy
0 mark baz executable
comparing with ../orig
searching for changes
no changes found