cannot delete leafIndexSet, but not allowd.

[[Imported from SVN: r3035]]

grid/albertagrid/albertagrid.cc

@@ -3888,9 +3888,8 @@ namespace Dune
     for(unsigned int i=0; i<levelIndexVec_.size(); i++)
       if(levelIndexVec_[i]) (*levelIndexVec_[i]).calcNewIndex();
 
-    if( leafIndexSet_ ) delete leafIndexSet_;
-    //if( leafIndexSet_ ) (*leafIndexSet_).resize();
-    //if( leafIndexSet_ ) (*leafIndexSet_).compress();
+    if( leafIndexSet_ ) (*leafIndexSet_).resize();
+    if( leafIndexSet_ ) (*leafIndexSet_).compress();
 
     // we have a new grid
     wasChanged_ = true;