explict export lists

Eliminated some dead code. In other cases, exported a currently unused
function, since it was a logical part of the API.

Of course this improves the API documentation. It may also sometimes
let ghc optimize code better, since it can know a function is internal
to a module.

364 modules still to go, according to
git grep -E 'module [A-Za-z.]+ where'

Utility/LogFile.hs

@@ -7,7 +7,15 @@
 
 {-# LANGUAGE CPP #-}
 
-module Utility.LogFile where
+module Utility.LogFile (
+	openLog,
+	listLogs,
+	maxLogs,
+#ifndef mingw32_HOST_OS
+	redirLog,
+	redir,
+#endif
+) where
 
 import Common