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scaling-helper.hh: modify default gradient bounds

According to Ipopt's documentation:

> As a guideline, we suggest to scale the optimization problem (either
> directly in the original formulation, or after using scaling factors) so
> that all sensitivities, i.e., all non-zero first partial derivatives,
> are typically of the order $ 0.1-10$ .

https://projects.coin-or.org/Ipopt/export/1026/html/documentation/node43.html

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