Rework/update commit

The reworked update and commit functionality of model.base.Referable-objects. The idea behind this rework can be found in #85 (closed)

added major-feature label

added 5 commits

• 32823ff2 - model.base.Referable: Modify upate() docstring for more precision
• 83feb767 - model.Referable: Update docstrings
• 0abb5939 - backends: Add custom Exception types for catching errors during Backend handling
• 0441a8a4 - test.examples.test_tutorials: Add missing todo
• 3ab36efa - model.base.Referable: Rework the find_source() function to be iterative...

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resolved all threads

added 2 commits

• 18e1b805 - model.base.Referable: Fix codestyle
• 5ec77910 - test.test_backends: Remove tests that are to be in test.model.test_base

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resolved all threads

added 1 commit

• 33271b8a - [WIP] test.model.test_base: Add test structure for Referable.update

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resolved all threads

added 1 commit

• 0800822b - model.base.Referable: Add instantiation of backend to be called for update and commit

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resolved all threads

added 2 commits

• 9ab2b68c - model.base.Referable: Remove instantiation of Backend class in update() and commit()
• 94f73fe8 - test.model.test_base: Add tests for Referable.update()

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added 2 commits

• 1550b79a - model.base.Referable: Fix building of relative_path by reversing the order
• 27ca1481 - test.model.test_base: Add tests for Referable.commit()

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