slog1p - Natural logarithm plus one log(x+1)

21.10 slog1p - Natural logarithm plus one $log(x +1)$

function slog1p (x) 
function slog1pf(x)

Given a value $x$ this function computes the natural logarithm of $x$ plus one, that is $log(x+ 1)$ . This function is more precise than using the equivalent operations.

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