Moved functions and variables about totalStress to the class Defect
Variables:
Stress totalStress
vector<Stress> totalStresses
Functions:
void setTotalStress(Stress s)
Stress getTotalStress() const
Stress getTotalStressAtIteration(int i) const
All classes that inherit Defect will obviously inherit these protected
data members and public functions.
Merge pull request #51 from adhishm/DefectTotalStress

Moved functions and variables about totalStress to the class Defect