Allow range = (rmin, rmax)

[pablosanjose]

Closes #86

Nothing much to discuss here. Just a note on implementation. Instead of doing a tree search with NearestNeighbors strictly in the (rmin, rmax) range, we still do a target candidate search with rmax, and then rely on the selector check to exclude those with norm below rmin. Also, eps(T) padding of range is done to ensure that range = (1,1) selects anything at distance 1, regardless of floating point errors.

[codecov-commenter]

Codecov Report

Merging #87 into master will increase coverage by 0.32%.
The diff coverage is 88.11%.

@@            Coverage Diff             @@
##           master      #87      +/-   ##
==========================================
+ Coverage   62.74%   63.06%   +0.32%     
==========================================
  Files          16       16              
  Lines        2668     2694      +26     
==========================================
+ Hits         1674     1699      +25     
- Misses        994      995       +1     

Impacted Files	Coverage Δ
src/Quantica.jl	100.00% <ø> (ø)
src/plot_makie.jl	0.00% <0.00%> (ø)
src/plot_vegalite.jl	0.00% <0.00%> (ø)
src/presets.jl	32.07% <ø> (ø)
src/lattice.jl	68.02% <87.50%> (+0.63%)	⬆️
src/model.jl	75.88% <89.28%> (+6.06%)	⬆️
src/hamiltonian.jl	75.07% <90.90%> (-0.56%)	⬇️
src/parametric.jl	84.04% <100.00%> (ø)
src/tools.jl	65.47% <100.00%> (-3.14%)	⬇️
... and 1 more

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