Added more accurate energy for states with non-penetrating states (l>5). A (worse) approximation was used before which itself is based on the polarisation energy.

Updated qds for K and Cs and Core polarisabilities to include two new publications. Also added a property to each class a_eff_d and a_eff_q which are the effective dipole and quadrupole polarisabilities of the species Ion (e.g. Cs+). This is used when calculating the polarisation energy which is used for high l states (l >5)

Improved accuracy of high l states to include effective polarisability calculation of energies. Uses constants from literature for the effective polarisabilities.
Also included hydrogenice fine stucture for these states (also g states) to remove degeneracy

Changed format of hydrogenic fine structure splitting (L.S coupling) for high l states.

Added references for calculating polarisation energy.