Rationalise logging in commit

Also:

Sort the output from an 'all' fetch one loop at a time

Make sure the test of scoring na empty file  is scoring an empty file

If it is an emtpy file we want to compact the fragment away - in which case it should score 0.0 not 100.0

src/leveled_log.erl

@@ -336,7 +336,7 @@
         {info, "Scoring of compaction runs complete with highest score=~w " 
                 ++ "with run of run_length=~w"}},
     {"IC004",
-        {info, "Score for filename ~s is ~w"}},
+        {info, "Score=~w with mean_byte_jump=~w for filename ~s"}},
     {"IC005",
         {info, "Compaction to be performed on ~w files with score of ~w"}},
     {"IC006",
@@ -406,9 +406,7 @@
     {"CDB20",
         {warn, "Error ~w caught when safe reading a file to length ~w"}},
     {"CDB21",
-        {warn, "File ~s to be deleted but already gone"}},
-    {"CDB22",
-        {info, "Positions ~w fetch"}}
+        {warn, "File ~s to be deleted but already gone"}}
         
     ]).