Hi, would it be possible to add a keyword to clabel to optionally switch off the angle fix in contour.py lines 384+?

# Fix angle so text is never upside-down
        if rotation > 90:
            rotation = rotation - 180.0
        if rotation < -90:
            rotation = 180.0 + rotation

Something like "clabel(CS, upsidedown=True)" with the default as False would do it.

I am using clabel to put directional arrows on a streamline contour plot, and this rotation causes some of the arrows to point the wrong way.  So it seems it would be a useful feature.  I'm willing to try to do it myself if somebody could tell me which files I would need to edit in addition to contour.py?

Many thanks,