minor fixes
Add save/discard buttons
chart2 first go
minor fixes
level-paramset creation after requirement creation overhaul

this was damn hard to get right. for the relations to become properly
serialized it was necessary to

1. create and save the level-paramsets
2. add one level-paramset to its level
3. save the level-paramset
4. save the level
5. repeat to 2-4 for all levels
6. add one level-paramsets to requirement
7. save level-paramsets
8. save the requirement

in this order. especially with a OneToMany relation it is always
necessary to add with pushObject to the many part. save the model on the
one side and only afterwards save the model on the many side.
remove fixtures
fix chart2 without data
update vaccine db
removing debug message