Fix static array that was needlessly declared double.
Add an option to explicitly set the ordering of written files.
Make sign of location match the sign of its dimension.
Add a reader for Scanco CT files.

This reader supports the following file types:
RAD (Radiology),
ISQ (MicroCT),
RSQ (MicroCT radon space) - untested,
AIM (MicroCT) - only uncompressed data