getElementNodeData assumes scalar field

[Jacob Merson]

The function here:

core/apf/apfElement.cc

Lines 122 to 127 in 8959c59

 void Element::getElementNodeData(NewArray<double>& d) 
 { 
   d.allocated() ? d.resize(nen) : d.allocate(nen); 
   for (int i = 0; i < nen; i++) 
     d[i] = nodeData[i]; 
 } 

Assumes that the field stored at the nodes is a scalar.

[Jacob Merson]

Closed based on #443