Hand-insert minus sign into MR tstiff
Expand region for stability checking
Fix classifier centering
Add PK2 const model as well
Add PK2 pressure finding, though not as useful as PK1
Add cauchy stress and spatial pressure
Add physicality penalty to kaveh cost
Add first elasticity tensor to MR
Allow single-load loading paths
Remove the kludgy minus sign
Rewrite mooney-rivlin function interface
Rewrite holzapfel function interface
Remove conversions of material model from model files
Add function to compute relevant vars along load path
Modularize loading_path plotting
Add SEDF to holz
Add Holzapfel-style derivation of tstiff (probably correct)
Remove cruft from elastic
Fix factor of 2 in holzapfel const model
Remove useless count from lintools