Penciller accepting push

Standardise on record definitions between modules to make easier - then
add functionality to pushing to penciller as bookie would do.  Some
initial manual testing of this seems OK.

include/leveled.hrl

@@ -0,0 +1,21 @@
+
+-record(sft_options,
+                        {wait = true :: boolean(),
+                        expire_tombstones = false :: boolean()}).
+
+-record(penciller_work,
+                        {next_sqn :: integer(),
+                        clerk :: pid(),
+                        src_level :: integer(),
+                        manifest :: list(),
+                        start_time :: tuple(),
+                        ledger_filepath :: string(),
+                        manifest_file :: string(),
+                        new_manifest :: list(),
+                        unreferenced_files :: list()}).
+
+-record(manifest_entry,
+                        {start_key :: tuple(),
+                        end_key :: tuple(),
+                        owner :: pid(),
+                        filename :: string()}).