Batch Rendering

It is possible to use AVS/Express to render image without interacting with the application user interface. A write_image module can be used to capture the image from the renderer. The application can be started with the -offscreen flag to prevent the user interface appearing. However AVS/Express still requires an X server to connect to even if no interface windows are visible. This means that the user cannot disconnect from HECToR once a batch rendering job has been submitted. This is a known problem in AVS/Express that has not been addressed in this project due to the extensive source code changes required to remove all X11 dependencies in offscreen mode.