Description

I'm working on a more general population based report. I had some ideas and did an exemplary implementation. An Example is shown here: xASL_report.pdf

I know the images still have to be rotated and maybe we can get them to align a bit better, but in general I think a report over multiple pages could be super useful.

How to test

• We should test subjects with one to five sessions, since it is supposed to cut off after four images at the moment.
• It is also supposed to skip missing images.
• It is also supposed to overwrite existing population based reports.

Release notes

Duplicate. Now done in #1225