Data display

We are in the process of implementing a new feature of the common display where one display an image either according to the orientation on the detector (i.e., the column direction up), or use the world coordinates in the header and display the image such that North is up. This later is specifically included as part of the target acquisition script for slit spectroscopy with ALFOSC where often the instrument is positioned at an angle different from the default (e.g., because the observation is done at the parallactic angle, or the slit needs to be aligned with specific features in the field) and it is difficult to recognized the field when comparing to a finding chart which has the standard orientation with North up.