mod_relpotcvt Module

A Driving routine to convert the TB-KKR potential from the non-relativistic representation VM2Z(IRMD,NPOTD), with IPOTD the combined index for ATOM and SPIN to the relativistic one. $$\begin{equation} V_{TREL}=\frac{V_{up}+V_{down}}{2} \end{equation}$$ $$\begin{equation} B_{TREL}=\frac{V_{up}-V_{down}}{2} \end{equation}$$ Additionally, for compatibility with the relativistic routines included in the package, VTREL includes the Coulomb term, and the auxiliary arrays ZREL, RMREL, JWSREL, DRDI, R2DRDI and IRSHIFT are created. IRSHIFT(NATYPD) accounts for the shift in the radial mesh, since the first point (sometimes first two points) of VM2Z ( = 0D0 ) are skipped. The relativistic routines require an odd number of radial points (Simpson integration routine)