The default value for the bifacial input "Ground clearance height" (for the spe, cec, 6par and mlm models), result in negative ground clearance heights during simulation (e.g., at 45 deg tilt)

Changing from the current default of 1 m to 2 m would give a ground clearance of 0.34 m at 90 deg tilt (vertical), for example.

1. If a bifacial module, should there be a check in the UI Callbacks for ground interference at vertical orientation?
2. Should the "Ground clearance height" just be automatically increased so the ground clearance equals zero at vertical if it would be less than zero?
3. If a bifacial module, should an error be raised (in lib_pv_io_manager.cpp?) if there's ground interference at vertical?