Hotfix/exchange functional fixes#29

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mkameda wants to merge 81 commits intostonerlab:developfrom

mkameda:hotfix/exchange-functional-fixes

Commits on Feb 6, 2020

Commits on Feb 7, 2020

Fixed Segmentation fault & now we can specity whether we use the form factors.
mkameda
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Commits on Feb 12, 2020

Some more comments are added.
mkameda
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Commits on Feb 28, 2020

Fixed exchange interaction matrix to be diagonal.
mkameda
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Commits on Mar 4, 2020

Added step function into exchange_functional for test run.
mkameda
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Commits on Mar 6, 2020

Fixed the size of kspace_path_ array.
mkameda
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Commits on Mar 7, 2020

Fixed possible maximum value of distance in r_space and added new function Lattice::get_lattice_dimensions().
mkameda
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Commits on Mar 11, 2020

Added multiple (up to three) Gaussian exchange functional.
mkameda
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Commits on Mar 12, 2020

Added real-space spin-spin correlation function into the NoLattice Monitor.
mkameda
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Commits on Apr 23, 2020

Commits on Apr 24, 2020

Commits on Jun 7, 2020

Commits on Jun 8, 2020

Commits on Jun 9, 2020

[Fixed] Added function calculating crystal limit spectrum ver2.
mkameda
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Commits on Jun 16, 2020

Commits on Nov 23, 2021

Added random potential
mkameda
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Commits on Nov 24, 2021