fix some mixed space+tab indentation

This fixes all instances of " \t" in the code base. Most common case
seems to be after a "where" line; probably vim copied the two space layout
of that line.

Done as a background task while listening to episode 2 of the Type Theory
podcast.

Types/Key.hs

@@ -133,7 +133,7 @@ prop_idempotent_key_decode f
 	| normalfieldorder = maybe True (\k -> key2file k == f) (file2key f)
 	| otherwise = True
   where
-  	-- file2key will accept the fields in any order, so don't
+	-- file2key will accept the fields in any order, so don't
 	-- try the test unless the fields are in the normal order
 	normalfieldorder = fields `isPrefixOf` "smSC"
 	fields = map (f !!) $ filter (< length f) $ map succ $

Types/MetaData.hs

@@ -290,4 +290,4 @@ prop_metadata_serialize f v m = and
 	, deserialize (serialize m') == Just m'
 	]
   where
-  	m' = removeEmptyFields m
+	m' = removeEmptyFields m

Types/StandardGroups.hs

@@ -96,7 +96,7 @@ standardPreferredContent UnwantedGroup = "exclude=*"
 
 notArchived :: String
 notArchived = "not (copies=archive:1 or copies=smallarchive:1)"
-  	
+	
 {- Most repositories want any content that is only on untrusted
  - or dead repositories, or that otherwise does not have enough copies.
  - Does not look at .gitattributes since that is quite a lot slower.