Tutorials and docummentation for IESH and BCME

[Nhertl]

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So far no documentation about the background of IESH and BCME and their scope exists in the group docs. The same goes with tutorials which explains how simulations are set up, what kind of pitfalls one can step in, and for which models they are applicable.

As a solution we ought to write a background, scope (i.e. which models are compatible) along with some small tutorials that introduce users to these simulation techniques.