Modifications in shell7 regarding xfem. Modified some xfem methods to work for nodes with three coordinates.
Merge branch 'master' of https://github.com/JimBrouzoulis/OOFEM_Jim
Merge branch 'master' of https://github.com/JimBrouzoulis/OOFEM_Jim
Some small modifications and added req. num of integration rules for wedges.