TDB2 Conversion

- Migrated several commands over to use TDB2.  Have to start somewhere.

src/commands/CmdCustom.cpp

@@ -93,7 +93,6 @@ int CmdCustom::execute (std::string& output)
 
   // Load the data.
   handleRecurrence ();
-  context.tdb2.commit ();
   std::vector <Task> filtered;
   filter (filtered);
 
@@ -177,6 +176,8 @@ int CmdCustom::execute (std::string& output)
     rc = 1;
   }
 
+  context.tdb2.commit ();
+
   output = out.str ();
   return rc;
 }