small fix for numElements to be zero.

Also, enable loadBalance again.

misc/examples/sizes.cc

@@ -134,7 +134,7 @@ void checkRefinements( GitterType& grid )
 // refine grid globally, i.e. mark all elements and then call adapt 
 template <class GitterType>
 void globalRefine(GitterType& grid, bool global, int step, int mxl,
-                  const bool loadBalance = false )
+                  const bool loadBalance = true )
 {
    {
      if (global)

src/parallel/gitter_pll_impl.cc

@@ -2324,8 +2324,9 @@ void GitterBasisPll :: printMemUsage ()
         allSize += indexMem;
       }
 
+      size_t perElement = ( numElements > 0 ) ? allSize/numElements : 0;
       cout << "All leaf size : " << allSize << " MB" << endl;
-      cout << "bytes per Element: " << allSize/numElements << endl; 
+      cout << "bytes per Element: " << perElement << endl; 
       cout << "Estimated all size : " << (9*long(allSize) / 8) << " MB" << endl;
 
       size_t build = container().memUsage();