Lineplots and unit handling

1. Unit Handling

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Previously we defined spatial and temporal units as attributes of the MeshSeries. This was troublesome to convey this information to the plot functions for individual meshes. We now leave it to the user to properly scale their meshseries spatially and temporally in the beginning with the newly implemented MeshSeries.scale function either with scalar factors or with units paris for conversion (input_unit, output_unit). In ot.plot.setup the spatial_unit and time_unit are adde for labeling the plots. If the MeshSeries is scaled with unit pairs the latter unit is also applied in plot.setup.

2. line plotting

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We had a quite convoluted functions and an exampled to plot linesamples. This MR reduces the releveant code to one function which should provide the means to all use cases. The examples is updated accordingly and should give a comprehensive overview.

1. Feature description was added to the changelog
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assigned to @FZill

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• e6d2a446 - [docs] improve feflow example

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• 8319d349 - [plot] simplified line plotting
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• 78df93d3 - [docs] improve feflow example

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TBD: I'M not sure what the better interface is for the unit convrsion in scale: I went with a tuple, i.e. (input_unit, output_unit). But I could also imagine a string with a special delimiter e.g. "input_unit->output_unit" or in practice: "m->km" instead of ("m", "km")

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• 7bbfbd09 - [meshlib] add scale function to ms, rm units
• 11d1cc87 - [plot] simplified line plotting
• 69662768 - [mypy] show absolute path in output
• 5520fd0c - [docs] improve feflow example
• f502bc52 - [docs] added changes to release notes

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• a3af3b45 - [docs] use correct RST formatting for inline code

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