Unfolding

Initial unfold implementation. Marked as draft because I don't know how to write tests for this. How should I compare 2 sfgs?

Closes #84 (closed)

Indeed not clear how to test it... I see two ways:

1. Some sanity checks of the type (can be applied in a loop of factors):
   1. Check that the number of operations of each type has increased N times
   2. Check that the number of delay elements is the same
   3. (Later: check that the iteration period bound has increased N times)
   4. Check that the SFGs simulate the same for some random input.
2. Use graph iso-morphism from networkx https://networkx.org/documentation/stable/reference/algorithms/isomorphism.html and predefine the correct answer for some cases. This requires being able to transform it into an actual graph though.

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• 6e37a83a...3d273210 - 15 commits from branch master
• 24972d3b - "Working" but untested unfolding
• de8ba549 - Add rudiemntary test sfg unfolding
• 391818c1 - Add more unfolding tests
• e1e32739 - Remove debug prints

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@oscgu95 this is now ready for review

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added 1 commit

• 0e7598a5 - Minor wording changes.

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added 8 commits

• 0e7598a5...bf6078f8 - 3 commits from branch master
• 1120d83b - "Working" but untested unfolding
• 2dfa7a04 - Add rudiemntary test sfg unfolding
• df17cad4 - Add more unfolding tests
• b7feba38 - Remove debug prints
• 0c22caa5 - Minor wording changes.

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