Not wrapper: excluding site indices and sublattices

[pablosanjose]

We need a way to specify excluded site indices and sublattices in selectors. Here we introduce a not wrapper that allows such a thing. For example, to create a random potential in all sites but the first

hamiltonian(lat, onsite(r -> randn(), indices = not(1)))

This can become quite complex, and includes hoppings, with things like

parametric(h, @onsite!(o -> o + randn(); sublats = not(:A)), @hopping!(t -> 2t; indices = (not(1:3) =>4:6, not(4 => 5))))

This can become a way to create vacancies in a system. For that, however, we need to support full siteselectors in unitcell, combined with the not functionality here to encode vacancy site indices. This latter functionality is currently not available, since unitcell only supports a region keyword.

[codecov-commenter]

⚠️ Please install the to ensure uploads and comments are reliably processed by Codecov.

Codecov Report

Attention: Patch coverage is 73.33333% with 4 lines in your changes missing coverage. Please review.

Project coverage is 62.07%. Comparing base (6f8d633) to head (de4ee8b).
Report is 1169 commits behind head on master.

Files with missing lines	Patch %	Lines
src/model.jl	73.33%	4 Missing ⚠️

❗ Your organization needs to install the Codecov GitHub app to enable full functionality.

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #97      +/-   ##
==========================================
- Coverage   62.12%   62.07%   -0.06%     
==========================================
  Files          16       16              
  Lines        2627     2634       +7     
==========================================
+ Hits         1632     1635       +3     
- Misses        995      999       +4     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.