Camera rotation angle = -1 * sky rotation angle

[teweitsai]

Check the camera_rotation_angle = -1 * sky_rotation_angle. This also need check with ts_ofc and ts_phosim to be consistent.

[teweitsai]

After the discussion with Dave, I think I need to be more careful about this issue. I need to check with Tiago that it is the scheduler to assign the CCS a rotation angle or an offset with the reading of CCS rotation angle first. I think an easy way to me now is just to use the sky rotation angle at this moment.

[teweitsai]

This is a related issue to #31.