Output time as double and not as float.

Former-commit-id: 7c551924fa14c32805ff50592c5b1515ce75a52a

src/parallel_io.c

@@ -541,7 +541,8 @@ void write_output_parallel(struct engine* e, struct UnitSystem* us,
   /* Print the relevant information and print status */
   writeAttribute(h_grp, "BoxSize", DOUBLE, e->s->dim, 3);
   writeAttribute(h_grp, "NumPart_ThisFile", UINT, numParticles, 6);
-  writeAttribute(h_grp, "Time", DOUBLE, &e->time, 1);
+  double dblTime = e->time;
+  writeAttribute(h_grp, "Time", DOUBLE, &dblTime, 1);
 
   /* GADGET-2 legacy values */
   numParticles[0] = (unsigned int)N_total;

src/serial_io.c

@@ -573,7 +573,9 @@ void write_output_serial(struct engine* e, struct UnitSystem* us, int mpi_rank,
 
     /* Print the relevant information and print status */
     writeAttribute(h_grp, "BoxSize", DOUBLE, e->s->dim, 3);
-    writeAttribute(h_grp, "Time", DOUBLE, &e->time, 1);
+    double dblTime = e->time;
+    writeAttribute(h_grp, "Time", DOUBLE, &dblTime, 1);
+
 
     /* GADGET-2 legacy values */
     numParticles[0] = (unsigned int)N_total;

src/single_io.c

@@ -430,7 +430,8 @@ void write_output_single(struct engine* e, struct UnitSystem* us) {
   /* Print the relevant information and print status */
   writeAttribute(h_grp, "BoxSize", DOUBLE, e->s->dim, 3);
   writeAttribute(h_grp, "NumPart_ThisFile", UINT, numParticles, 6);
-  writeAttribute(h_grp, "Time", DOUBLE, &e->time, 1);
+  double dblTime = e->time;
+  writeAttribute(h_grp, "Time", DOUBLE, &dblTime, 1);
 
   /* GADGET-2 legacy values */
   writeAttribute(h_grp, "NumPart_Total", UINT, numParticles, 6);