annex.hardlink extended to also try to use hard links when copying from the repository to a remote.

Also, it used to only check that one of the repos was not in direct mode;
now when either repo is direct mode, annex.hardlink won't have an effect.

doc/todo/annex.hardlink_should_also_affect_copy_to_origin.mdwn

@@ -3,3 +3,5 @@ repository when eg `git annex copy --from origin`. This should also
 be done when copying files --to origin (or other remotes on the same
 filesystem). This way, a quick shared clone can be used to add/modify
 files, and cheaply send the changes back to the parent repo. --[[Joey]]
+
+> [[done]] --[[Joey]]