Add expected unit warning to relevant configuration parameters

[aaraney]

Some parameters added around the time of #120 do not warn in units are not included if CFE_DEBUG is enabled. Thoughts on adding these warnings?

Im sure i've missed some, but here are the ones that came to mind:

retention_depth_nash_surface -> [m]
Kinf_nash_surface -> [h^-1]
nash_storage_surface -> [m]
K_nash_surface -> [h^-1]