Merge pull request #132 from fmi-basel/zillum

Add:

- Calculate Z-Illumination Correction task
- Apply Z-Illumination Correction task

Merge pull request #128 from fmi-basel/add_docs_info

Add task description to all tasks

Merge pull request #127 from fmi-basel/docs_url

Add docs_link to manifest

Merge pull request #123 from fmi-basel/add_task_metadata

Add task metadata

Bug fix in Surface Mesh Multiscale Task.

If label image of input region is empty, skip region.

Update Fractal manifest.

Add expansion and max intensity rescale to Segment by Intensity Thres…

…hold task.

Update Fractal manifest accordingly.

Weighted sum of channel images in Segment by Intensity Threshold task.

Update Fractal manifest.

Merge pull request #120 from fmi-basel/threshold

Update Segment by Intensity Threshold task