Add queue status as a menu entry, remove it from projects, add dedicated page

See merge request !68

Gitlab ci retry

See merge request !72

dump metadata in a celery task, backend serve the content of the metadata file

See merge request !71

Fix issue 121 122

See merge request !70

Handle corrupted worktable, and invalid gencov

See merge request !69

raise an error 500 when such errors are caught
Catch error 500 in frontend, and show error detail to user

Give name to csv files

Closes #119

See merge request !65

re-organise workflow definition to add management task after checking if we have something to do. Add comments

fixing queue status polling

See merge request !66

Show queue status

See merge request !64

Closes #115

Fixes #119