altitude map of extended depth of focus projection

dear Robert,
this is a sticky note following our discussion at the NEUBIAS course.

it would be great if the "extended depth of focus projection" of CLIJ2 could output not only the "focused" image but also the "altitude" of the best focus. this would allow to process the image on the dapi channel for instance and then apply the best focus to other channels.

many many thanks!
Benoit

No file or test is named. Start by locating the CLIJ2 operation that implements extended depth of focus projection and trace how it produces the focused image. Done means the operation also exposes the altitude of the best focus so that focus information from one channel can be applied to other channels.

Written by the indexing model from the issue text.