refactor ExportActions

This will allow disabling exports for remotes that are not configured to
allow them. Also, exportSupported will be useful for the external
special remote to probe.

This commit was supported by the NSF-funded DataLad project

Remote/Ddar.hs

@@ -19,6 +19,7 @@ import qualified Git
 import Config
 import Config.Cost
 import Remote.Helper.Special
+import Remote.Helper.Export
 import Annex.Ssh
 import Annex.UUID
 import Utility.SshHost
@@ -60,11 +61,7 @@ gen r u c gc = do
 		, lockContent = Nothing
 		, checkPresent = checkPresentDummy
 		, checkPresentCheap = ddarLocal ddarrepo
-		, storeExport = Nothing
-		, retrieveExport = Nothing
-		, removeExport = Nothing
-		, checkPresentExport = Nothing
-		, renameExport = Nothing
+		, exportActions = exportUnsupported
 		, whereisKey = Nothing
 		, remoteFsck = Nothing
 		, repairRepo = Nothing