Find eigenvalues/vectors of specific non-node equilibrium points

Equilibrium point vectors can now be passed in. Only basic checks are performed so vectors that aren't actually equilibria could be passed too.

Signed-off-by: Andrew D. Horchler <adh9@case.edu>
Improved mean period simulation for small period cases

Integration time step is now chosen based on the minimum transition time instead of using a fixed step size. Could still be better. Inefficient for large periods in parts.

Signed-off-by: Andrew D. Horchler <adh9@case.edu>