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Add support for coloured graphs to `Heisenberg`

Vicentini Filippo requested to merge github/fork/attila-i-szabo/heisenberg-colour into master

Created by: attila-i-szabo

This PR allows to use Heisenberg operators on coloured graphs, using a different J and sign-rule policy on edges with different colours, so it can be used with #970 easily.

The original calling sequence is still valid. In addition, J can be a list with as many elements as colours in the graph: the first element is used for colour 0, etc. By default, there are no sign rules, but a sign_rule list can be passed (must have the same length as J).

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