fix nondimensional scaling factors in 1D N-S and characteristic equations
for unconverged 1D N-S/Chars, revert dynamic variables to pre-solve state before next iteration
fix 1D0D navier-stokes coupling by adding controlLoopPostLoop routine
add tolerance pointer to while control loop for convergence check (while loop exit criteria)
fix and generalise 1D characteristic wave extrapolation for branches and coupled boundaries
merge of soroush's recent changes
coherence check for lambda during characteristic extrap; fix for spline file read
add Burkhardt spline interpolation
add penalty coefficient to 1D flux upwinding terms to enforce conservation of mass/momentum at branches
temp working state for 1D0D coupling
fix for 1D Navier-Stokes/Characteristic iterative coupling to working state- still need to clean up and tweak C solver convergence