[Therion] therionsurface2survex can flip grids now

[Benedikt Hallinger]

Hello, 
as some of you already know, the therionsurface2survex tool can generate surface meshes for aven out of therion surface or gdal grids. This allows for example to display a 3d-grid in loch and aven, and to take measures between cave and surface in aven.

Today i enhanced the tool so it can understand the grid-flip command: https://github.com/hbeni/therionsurface2survex/issues/2#issuecomment-787776692
Also negative step size in gdal headers yield flipped grids.

It would be cool if some people here could test it with real datasets :)
The test case does what i would expect, but I’m not sure i fully understood the input data and its implications.
Before i merge the feature, i would be much more confident by test results from more proficient people than me.

Thanks and greetings!
Beni
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