[Requirements] Simplify MIRA GUI
Requirements show too much information at once.
This should be split in various tabs:
- Main tab: ID, title, description, rationale, author, source, priority, images, document reference
- Traceability tab: all info about traces
- Checklist tab: like before, but also with status
- Rest tab: Todo, comment, safety
(from redmine: issue id 2713, created on 2016-10-11, closed on 2017-11-29)