Adding simple support for copying elemental solutions from exodus files

This adds really simple and very stupid support for copying elemental solutions from exodus files. I tested it on a very simple mesh with one block and that's working.  If the mesh has more blocks and element numbering gets funky, this will probably not work. However I have no idea how to deal with such a situation.  This patch should help MOOSE to load simple solutions into elemental fields (that's the motivation here).