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- CellLine is an optional field in TestActivityDescription
- fixes #12, fixes #27


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indirectly fixes #10


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closes #40


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fixes #21

fixes #39

fixes #18

change data model and migration script

(start working on #18)

(unique fields are automatically indexed in Django)

disease rows are now unique and managed with a manytomany field
fixes #19

from PPI, CompoundAction, TestActivityDescription
fixes #37

fixes #24

- separate Ppi into Ppi and PpiComplex classes (fixes #36)
- replace ActivityType table with an enumerated type
- remove complex from foreign keys when not required

closes #35

further progress requires to answer question asked in #36

(closes #9)

Add Wizard form functionalities to generate successive forms & update css according to the new forms.

Update Django admin page and Admin session. Create forms needed and update css file for forms elements