changes invertlaplace method to Stehfest Algorithm to make Gringarten model more stable #266
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Addresses issue #264
Increasing fracture area made Inverse Laplace method used in Gringarten reservoir model (MPF model) unstable (flow per fracture divided by fracture area became too small). Switching from the Talbot to the Stehfest Algorithm fixes this issue and allows running with fracture area of 320 m by 320 m.