Floats not supported in Omega_h adapter

[philip-davis]

pcms/src/wdmcpl/omega_h_field.h

Line 207 in d60e8fc

std::variant<OmegaHField<Omega_h::I8, InternalCoordinateElement>,

The XGC adapter supports single-precision floats, but the Omega_h adapter does not. Attempts to use floats with the Omega_h adapter result in fairly difficult to interpret error messages when doing AddField (at least in gcc). This isn't a bug, but the asymmetry does generate some amount of surprise. There is no single-precision Omega_H type, which is presumably why the Omega_h adapter does not support it.