Fix Horizontal Cross-Section Actor for right bounding box longitude coordinate greater or equal 180
Horizontal Cross-Section aren't rendered properly if the right bounding box border crosses 180. in longitude.
It seems like the right border is mapped to its according longitude in the interval [-180.,180.] since if one enlarges the width enough, the cross-section reappears (=> var->nlons is computed wrong)
Edited by Bianca Tost