#6 Support multiple assessments per chemical

[Nina Jeliazkova]

Currently, a PBT assessment is linked to a structure, one can have only one assessment per structure.

Proposal: An assessment is a separate (named) entity, a chemical can have multiple assessments. The functionality should offer:

CREATE new PBT Assessment
USE EXISTING PBT Assessment
CANCEL PBT Assessment (only when workflow exists)
SAVE PBT Assessment (only when workflow exists)
EXPORT PBT Assessment as file (only when workflow exists)