Don't link snapshots

If a snapshot breaks a penciller clone, this shouldn't crash the main process.

src/leveled_penciller.erl

@@ -170,6 +170,7 @@
         code_change/3]).
 
 -export([
+        pcl_snapstart/1,
         pcl_start/1,
         pcl_pushmem/2,
         pcl_fetchlevelzero/2,
@@ -310,6 +311,12 @@
 pcl_start(PCLopts) ->
     gen_server:start_link(?MODULE, [PCLopts], []).
 
+-spec pcl_snapstart(penciller_options()) -> {ok, pid()}.
+%% @doc
+%% Don't link to the bookie - this is a snpashot
+pcl_snapstart(PCLopts) ->
+    gen_server:start(?MODULE, [PCLopts], []).
+
 -spec pcl_pushmem(pid(), bookies_memory()) -> ok|returned.
 %% @doc
 %% Load the contents of the Bookie's memory of recent additions to the Ledger