DTSS: remove time returning by start function

src/artis-star/kernel/dtss/Dynamics.hpp

@@ -51,8 +51,7 @@ namespace artis {
             virtual void transition(const common::Bag<Time>& /* x */,
                     typename Time::type /* t */) { }
 
-            virtual typename Time::type
-            start(typename Time::type/* time */) { return Time::infinity; }
+            void start(typename Time::type/* time */) { }
 
             virtual common::Bag<Time> lambda(
                     typename Time::type /* time */) const { return common::Bag<Time>(); }