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implemented -bhess option in xtb thermo submodule #1004

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Frequencies of the hessian file need to be scaled to remove the frequency shift caused by the bias RMSD potential. With the --bhess flag, xtb thermo now reads in an hessian_sph file from a previous xTB SPH calculation and scales the frequencies accordingly to reproduce the thermo contributions of the xTB SPH calculation.

Signed-off-by: Johannes Gorges <58849467+gorges97@users.noreply.github.com>
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