[feature] Expose sensitivity measures such as PTDF

[leuchtum]

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Problem Description

Sensitivity measures such as the power transfer distribution factors (PTDF) are part of modern power network analytics. They are commonly used in market analytics, congestion management, stability analysis and more. Currently the PTDFs are calculated by pypower.makePTDF and therefore _pd2ppc needs to be used by the user. This is error prone, as one needs to deal with indices and more.

Feature Description

I suggest to expose the calculation of sensitivity measures directly, something like pp.ptdf(net). There has already been interest in this feature, as #847, #1419, #1572 and #1622 have shown.

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