Code reduction refactor

An attempt to refactor out more complex code.

The Penciller clerk and Penciller have been re-shaped so that there
relationship is much simpler, and also to make sure that they shut down
much more neatly when the clerk is busy to avoid crashdumps in ct tests.

The CDB now has a binary_mode - so that we don't do binary_to_term twice
... although this may have made things slower ??!!?  Perhaps the
is_binary check now required on read is an overhead.  Perhaps it is some
other mystery.

There is now a more effiicient fetching of the size on pcl_load now as
well.

include/leveled.hrl

@@ -22,7 +22,8 @@
 
 -record(cdb_options,
                         {max_size :: integer(),
-                        file_path :: string()}).
+                        file_path :: string(),
+                        binary_mode = false :: boolean()}).
 
 -record(inker_options,
                         {cdb_max_size :: integer(),