get, move, copy, mirror: Added --failed switch which retries failed copies/moves

Note that get --from foo --failed will get things that a previous get --from bar
tried and failed to get, etc. I considered making --failed only retry
transfers from the same remote, but it was easier, and seems more useful,
to not have the same remote requirement.

Noisy due to some refactoring into Types/

Assistant/Threads/Committer.hs

@@ -17,7 +17,7 @@ import Assistant.Alert
 import Assistant.DaemonStatus
 import Assistant.TransferQueue
 import Assistant.Drop
-import Logs.Transfer
+import Types.Transfer
 import Logs.Location
 import qualified Annex.Queue
 import qualified Git.LsFiles

Assistant/Threads/Cronner.hs

@@ -24,7 +24,7 @@ import Utility.HumanTime
 import Utility.Batch
 import Assistant.TransferQueue
 import Annex.Content
-import Logs.Transfer
+import Types.Transfer
 import Assistant.Types.UrlRenderer
 import Assistant.Alert
 import Remote

Assistant/Threads/Glacier.hs

@@ -14,6 +14,7 @@ import Assistant.Common
 import Utility.ThreadScheduler
 import qualified Types.Remote as Remote
 import qualified Remote.Glacier as Glacier
+import Types.Transfer
 import Logs.Transfer
 import Assistant.DaemonStatus
 import Assistant.TransferQueue

Assistant/Threads/SanityChecker.hs

@@ -38,7 +38,7 @@ import Git.Repair
 import Git.Index
 import Assistant.Unused
 import Logs.Unused
-import Logs.Transfer
+import Types.Transfer
 import Annex.Path
 import qualified Annex
 #ifdef WITH_WEBAPP

Assistant/Threads/TransferPoller.hs

@@ -9,6 +9,7 @@ module Assistant.Threads.TransferPoller where
 
 import Assistant.Common
 import Assistant.DaemonStatus
+import Types.Transfer
 import Logs.Transfer
 import Utility.NotificationBroadcaster
 import qualified Assistant.Threads.TransferWatcher as TransferWatcher

Assistant/Threads/TransferScanner.hs

@@ -16,6 +16,7 @@ import Assistant.Drop
 import Assistant.Sync
 import Assistant.DeleteRemote
 import Assistant.Types.UrlRenderer
+import Types.Transfer
 import Logs.Transfer
 import Logs.Location
 import Logs.Group

Assistant/Threads/TransferWatcher.hs

@@ -10,6 +10,7 @@ module Assistant.Threads.TransferWatcher where
 import Assistant.Common
 import Assistant.DaemonStatus
 import Assistant.TransferSlots
+import Types.Transfer
 import Logs.Transfer
 import Utility.DirWatcher
 import Utility.DirWatcher.Types

Assistant/Threads/Transferrer.hs

@@ -10,7 +10,7 @@ module Assistant.Threads.Transferrer where
 import Assistant.Common
 import Assistant.TransferQueue
 import Assistant.TransferSlots
-import Logs.Transfer
+import Types.Transfer
 import Annex.Path
 import Utility.Batch