Option to chunk large images to reduce memory overhead

[tresf]

Some print operations (e.g. 1200 dpi images) cause OutOfMemoryError errors on machines with lower memory available.

This is a placeholder to investigate the possibility of leveraging a disk buffering system to chunk the data into several smaller pieces at print time.

Example loading an image in chunks from disk: https://stackoverflow.com/a/15149382/3196753