Add annex-trustlevel configuration settings, which can be used to override the trust level of a remote.

This overrides the trust.log, and is overridden by the command-line trust
parameters.

It would have been nicer to have Logs.Trust.trustMap just look up the
configuration for all remotes, but a dependency loop prevented that
(Remotes depends on Logs.Trust in several ways). So instead, look up
the configuration when building remotes, storing it in the same forcetrust
field used for the command-line trust parameters.

Annex.hs

@@ -40,7 +40,6 @@ import qualified Types.Remote
 import Types.Crypto
 import Types.BranchState
 import Types.TrustLevel
-import Types.UUID
 import qualified Utility.Matcher
 import qualified Data.Map as M
 
@@ -84,7 +83,7 @@ data AnnexState = AnnexState
 	, forcebackend :: Maybe String
 	, forcenumcopies :: Maybe Int
 	, limit :: Matcher (FilePath -> Annex Bool)
-	, forcetrust :: [(UUID, TrustLevel)]
+	, forcetrust :: TrustMap
 	, trustmap :: Maybe TrustMap
 	, ciphers :: M.Map EncryptedCipher Cipher
 	, flags :: M.Map String Bool
@@ -106,7 +105,7 @@ newState gitrepo = AnnexState
 	, forcebackend = Nothing
 	, forcenumcopies = Nothing
 	, limit = Left []
-	, forcetrust = []
+	, forcetrust = M.empty
 	, trustmap = Nothing
 	, ciphers = M.empty
 	, flags = M.empty