EDIT

Add test for importing two dna units with associated units

Map preparation material to derivation event description

Test import of sparse ABCD file

Evaluate unit association type in ABCD import

• added test
• correctly set derivative hierarchy

Split up test for unit associations

Parse sample designation in ABCD GGBN import

Import associated units

• Set derivation event correctly
• adapted test

Import associated units via BioCase query

Import associated units in ABCD import

Worked on the order of importing units especially when associated units
are present.
Adapted test.

??