fixed some segfaults

src/main.c

@@ -20,6 +20,7 @@ int main(int argc, char **argv) {
 	/*create trivial path towards the origin*/
 	p = path_new(&t->map,&t->vehicle);	
 	
+	trial_wait_for_input(t);
 	while(t->alive){
 		trial_wait_for_input(t);
 		path_execute(t,p);

src/path.c

@@ -20,6 +20,8 @@ path *path_new(map* m,vehicle *v){
 	command* tmp;
 	path* res;
 	double angle, stop;
+
+	res = g_slice_new(path);
 	res->commands = g_queue_new();
 	/* Calculate a trivial path to the origin*/