Change pyqtgraph image format from column-major to row-major

[drogenlied]

From pyqtgraph 0.10.0 on, there is the option to use images in row-major format, which is how these things are usually done in C and Python.

Column-major format is a Fortran leftover.

Doing that is quite some work but will probably save a rotation and a transpose for each time an image is updated.

[drogenlied]

Done everywhere except MagnetGUI.