Allow for feeds at different stages (more than 2 feeds is now possible).
Allow for extract and raffinate side draws.
Faster (twice as fast given partition coefficients) simulation by implementing Thomas algorithm for solving tridiagonal matrix (in mass and equilibrium balances).
Closure of overall mass balance (absolute zero generation/consumption of components regardless or convergence tolerance).
Partition data now given in the form of Extract/Raffinate (instead of Raffinate/Extract).
Updates to mixer settlers: