Important AfrhoThermal correction.  getgeom fixes.

The flux given Afrho was a factor of 4 off in AfrhoThermal.  The formula to compute A(0), where A is the a in Afrho, was not considering the factor of 4 difference between A'Hearn et al. (1984)'s A and Ap in Hanner 1981.

getgeom updated for the latest version of SolarSysObject.