Use exponential detrainment limiter and apply to all entr function types

[costachris]

Use exponential detrainment limiter instead of the currently-used logistic function and apply to all entr function types.

Original

$$ \left(2 - \frac{1}{{1 + \exp(-\gamma{lim} \times (a{max} - a_{up}))}}\right)^{\beta_{lim}} - 1$$

Exponential

$$ \gamma{lim} \exp(-\beta_{lim} \times (a{max} - a_{up}))$$

A comparison of the two formulations is provided below (one on a log scale)

[szy21]

Oh, a minor thing. If you make this change the description in CLIMAParameters is not accurate anymore: https://github.com/CliMA/CLIMAParameters.jl/blob/945eb72ea84cf5ad8231bcdd7715e8a57dd11e45/src/parameters.toml#L2250-L2260. Not sure if we should change it too?

[costachris]

bors r+

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