Don't abort when backup files already exist. Don't allow alternative names.
Rationale:
- When the user wants to revert, he shouldn't be stopped from doing
this just because some old backups will be overwritten.
- To not clobber important files by accident, alternative names for backup
files were disabled. As the backup target now has a fixed name, the user
doesn't have to be informed about the backup copy (unless --verbose)
1:f248da0d4c3e
0:9eca13a34789
f248da0d4c3e tip
9eca13a34789
9eca13a34789+
reverting file1
9eca13a34789
f248da0d4c3e tip
merge: warning: conflicts during merge
merging file1
merging file1 failed!
diff -r f248da0d4c3e file1
--- a/file1
+++ b/file1
@@ -1,3 +1,7 @@ added file1
added file1
another line of text
+<<<<<<<
+changed file1 different
+=======
changed file1
+>>>>>>>
M file1
f248da0d4c3e+ tip
reverting file1
f248da0d4c3e tip
f248da0d4c3e tip
f248da0d4c3e tip