Add RPC & client call to replay a transaction. (#1734)

* Add RPC & client call to replay a transaction.

* Address grumbles

ethcore/src/trace/executive_tracer.rs

@@ -50,6 +50,7 @@ impl Tracer for ExecutiveTracer {
 				output: output.expect("self.prepare_trace_output().is_some(): so we must be tracing: qed")
 			})
 		};
+		debug!(target: "trace", "Traced call {:?}", trace);
 		self.traces.push(trace);
 	}
 
@@ -64,6 +65,7 @@ impl Tracer for ExecutiveTracer {
 				address: address
 			})
 		};
+		debug!(target: "trace", "Traced create {:?}", trace);
 		self.traces.push(trace);
 	}
 
@@ -74,6 +76,7 @@ impl Tracer for ExecutiveTracer {
 			action: Action::Call(call.expect("self.prepare_trace_call().is_some(): so we must be tracing: qed")),
 			result: Res::FailedCall,
 		};
+		debug!(target: "trace", "Traced failed call {:?}", trace);
 		self.traces.push(trace);
 	}
 
@@ -84,6 +87,7 @@ impl Tracer for ExecutiveTracer {
 			action: Action::Create(create.expect("self.prepare_trace_create().is_some(): so we must be tracing: qed")),
 			result: Res::FailedCreate,
 		};
+		debug!(target: "trace", "Traced failed create {:?}", trace);
 		self.traces.push(trace);
 	}
 
@@ -98,6 +102,7 @@ impl Tracer for ExecutiveTracer {
 			}),
 			result: Res::None,
 		};
+		debug!(target: "trace", "Traced failed suicide {:?}", trace);
 		self.traces.push(trace);
 	}