ignore .DS_Store

Pm/PmDirCache.icl

@@ -44,6 +44,8 @@ where
 		= ((errs,cache),files)
 
 	//removedups :: !.[(String,String,DateTime)] -> .[(String,String,DateTime)]
+	removedups [x=:(".DS_Store",_,_):xs]
+		= removedups xs
 	removedups [x=:(l,p,_):xs]
 		# (wrn,xs)					= dropWarn (\(r,_,_) -> l==r) xs
 		| isEmpty wrn