Display meaning of Object "size" values

[firthm01]

It is not clear what these values actually mean. Since we are working in spherical coordinates, a value of 1 for width and height is actually 360 degrees - it would be useful if the translation of the normalised value was displayed as a Label under the width and height value boxes.

Likewise, for depth, this a "ratio" of distance according to the standard. In practice, this is implemented in EAR as distance ± depth / 2 - therefore it would be useful to show the calculated depth/distance range below the depth value box.