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/Process/Transcript.hs

@@ -8,7 +8,11 @@
 {-# LANGUAGE CPP #-}
 {-# OPTIONS_GHC -fno-warn-tabs #-}
 
-module Utility.Process.Transcript where
+module Utility.Process.Transcript (
+	processTranscript,
+	processTranscript',
+	processTranscript'',
+) where
 
 import Utility.Process
 import Utility.Misc