Interface refactoring

Find a design which is more intuitive and minimal.

assigned to @Kostas

From the previous MR, the summary from @anton-akhmerov still applies: in particular the points about short-range interactions and the separation between mean field parameters and interaction range.

!3 (comment 72112)

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• 8f56ff50 - define mean field model classes
• 0bd4ae7e - remove unfinished constant energy terms
• 75dc86c1 - remove redundant functions
• 0e4871c1 - evaluate mfModels on a kgrid
• 19c3b598 - prototype solvers
• 8e5b7d74 - example nb of current interface

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The utils file is becoming bloated so it should be split up to make it more organised. I identify the following categories:

1. Mean-field calculation related(get_fermi_energy())
2. Random guess generation
3. TB model construction and evaluation on k-grid
4. Matrix re-shaping for I/O.

Each of them should get its own file.

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• 4ac2691a - prototype main idea of new algo

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• 8c18865f - fix bug in exchange calculation

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• aad6d6b1 - assemble a test solver for prototype

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• cdba8420 - use non-zero guess add subtract Fermi energy to get to the correct groundstate

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• ca86a37e - prototype new local implementation

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• e20572c5 - pipe nK to all functions properly
• 5779f3a8 - remove quad test in import
• ea4a272e - rm redundant comment

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• c1973998 - check hermiticity of tb models

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• 701c4ec4 - add kwant helpers funcs
• 39a621da - update import path

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• e1f85c03 - 2D graphene example not working

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• 021a55ae - fix ifft input grid order

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• ac594a1d - use main version for utils

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• 99a589bc - remove kspace transformation for guess generation

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• 7c6d8ce0 - generate hermitian guesses

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• 741a0084 - pull from origin/main utils
• 3170357d - fix relative imports
• 72b05849 - add test for parametrisation

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• 9c4bf187 - add minimal example and function for hopping dict to flat and back

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• 468368a3 - rm tests from main func
• 1fb2ba2d - implement Johannas parametrisation
• 0fb8a804 - increase mf guess amplitude
• 2c754354 - working graphene example

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