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Previous restrictions were for datacat business logic.

Parameters are modelled as a string attribute on Script entity type. This is
simply transformed as options for the underlying Python script upon execution.

Closes #10428307.

Avoids relative imports.

The former will allow for storing large stderr output (e.g. log files), the
latter makes it possible for a script to change the format of its output.

Each script is run using the output of its predecessor as input. Store
transitional data in temporary file and retrieve the last product of
transformation to attach it to the process entity.

Closes #10428298.

The script sequence consists of sequence items, with an index corresponding to
their position in the sequence and a relation to a script.

Simplify tests in unittest_entities, drop tests for things that are not
actually used (and dropping those things as well).

Related to #10428298.

Closes #10267618.