Revert "Strain maps + vector calculations"

This reverts commit 9b521e9d34a4116a57ffa88fea2a8f353c3c54d7.
Tensile Plots from DIC

I have plotted the new stress curves with the corrected stress values.
There was not much shift between the stress and the strain in terms of
time so the ultimate stress strain curve looks better. However i am
unable to calculate the min/max point to correct for the little shift
that there is between the 2 curves