change MaxCnt from 4 to max(4,max_level+1) for how many iterations we… (#3588)

… allow in creation of the initial grid hierarchy

Author: asalmgren

Src/Amr/AMReX_Amr.cpp

@@ -3085,7 +3085,7 @@ Amr::bldFineLevels (Real strt_time)
     {
         bool grids_the_same;
 
-        const int MaxCnt = 4;
+        const int MaxCnt = std::max(4, max_level+1);
 
         int count = 0;