git-remote-annex support exporttree=yes remotes

Put the annex objects in .git/annex/objects/ inside the export remote.
This way, when importing from the remote, they will be filtered out.

Note that, when importtree=yes, content identifiers are used, and this
means that pushing to a remote updates the git-annex branch. Urk.
Will need to try to prevent that later, but I already had a todo about
that for other reasons.

Untested!

Sponsored-By: Brock Spratlen on Patreon

Types/Difference.hs

@@ -17,6 +17,7 @@ module Types.Difference (
 	differenceConfigVal,
 	hasDifference,
 	listDifferences,
+	mkDifferences,
 ) where
 
 import Utility.PartialPrelude