General task view improvements

[zeileis]

Format: We have converted the old XML-based task views file now to the new Markdown-based format. Please check the resulting .md file whether everything is in order or some corrections/improvements are needed. See the corresponding documentation for more details.

Update: This would also be a good time to check the entire task whether it is up to date and correct. A write-up of the general goals and content guidelines is now summarized in the workflow for proposing new task views (which was not yet available when you authored your task view). Improving your task view to conform more closely with these goals and guidelines, if necessary, would be highly appreciated.

Co-maintainers: In particular, we strongly encourage that all task views not only have a principal maintainer but also 1-5 co-maintainers in order to get more inspirations for extensions/improvements and share the maintenance workload. So please try to extend the list of co-maintainers, ideally also including female contributors and generally involving persons with diverse backgrounds.

[rsbivand]

Revisions complete

[zeileis]

Thanks, made your project now "Public" and included it in the ctv/README.md.