Coordinates on status line

[peterbandi]

It would be very useful to have to following information displayed on the status line or maybe somewhere at the sidebars:

1. Coordinates of the cursor in millimeters.
2. Coordinates of the cursor in pixels.
3. The current displayed level.
4. Value under the cursor (RGB, unsigned char or float)

And the same for the loaded cancer detection data.

[peterbandi]

Some of them are already implemented. I run into this again. It would be really nice to have. If the the pixel values under the cursor are rarely needed. If it cannot be implemented in an efficient way a new "Inspect" cursor mode would be also okay, where ASAP would display the coordinates and values under the cursor on click.