Add scene.hdr camera angle adjustability

[etoni044]

HDR generated images of the scene from running scene.saveImage() automatically set the view angle to be from the East/West. This works well for south-facing tilted arrays, but results in images that are not particularly useful for visualizing east-west oriented arrays. For example, I am running E-W vertical systems, which result in images like the following:

It would be useful to add some simple ways to adjust the camera angle for images generated with scene.saveImage.