Copy additional data from old Castro level on regrid (#1122)

On a regrid where we're copying data from an existing level, we need to make sure we copy the class data relevant to post_timestep if a retry has occurred. This change copies some of these scalar parameters, and also fillpatches the old data in addition to the new data (if the old data is available in the state we're copying from).

Source/driver/Castro.cpp

@@ -1354,8 +1354,34 @@ Castro::init (AmrLevel &old)
     for (int s = 0; s < num_state_type; ++s) {
         MultiFab& state_MF = get_new_data(s);
         FillPatch(old, state_MF, state_MF.nGrow(), cur_time, s, 0, state_MF.nComp());
+        if (oldlev->state[s].hasOldData()) {
+            if (!state[s].hasOldData()) {
+                state[s].allocOldData();
+            }
+            MultiFab& old_state_MF = get_old_data(s);
+            FillPatch(old, old_state_MF, old_state_MF.nGrow(), prev_time, s, 0, old_state_MF.nComp());
+        }
     }
 
+    // Copy some other data we need from the old class.
+    // One reason this is necessary is if we are doing
+    // a post-timestep regrid -- then we're going to need
+    // to save information about whether there was a retry
+    // during the timestep.
+
+    iteration = oldlev->iteration;
+    sub_iteration = oldlev->sub_iteration;
+
+    sub_ncycle = oldlev->sub_ncycle;
+    dt_subcycle = oldlev->dt_subcycle;
+    dt_advance = oldlev->dt_advance;
+
+    keep_prev_state = oldlev->keep_prev_state;
+
+    lastDtRetryLimited = oldlev->lastDtRetryLimited;
+    lastDtFromRetry = oldlev->lastDtFromRetry;
+    in_retry = oldlev->in_retry;
+
 }
 
 //