work tree upon delete/modify conflict.
* "git merge -s recursive" didn't leave the index unmerged for entries with
- rename/delete conflictd.
+ rename/delete conflicts.
* "git merge -s recursive" clobbered untracked files in the work tree.
-* "git mv -k" with more than one errorneous paths misbehaved.
+* "git mv -k" with more than one erroneous paths misbehaved.
* "git read-tree -m -u" hence branch switching incorrectly lost a
subdirectory in rare cases.