Fix root_lattice_recognition

[StevellM]

root_sublattice allowed odd root lattices but the recognition function did not. So I introduce the root lattice $I_1$ for odd lattices, which is just the odd (positive definite) unimodular lattice of rank 1.
@simonbrandhorst

[thofma]

@simonbrandhorst looks good to you?

[simonbrandhorst]

Could you please sort the output of root_lattice_recognition?
This would assure a consistent output and that two root lattices are isometric
if and only if the root_lattice_recognition output coincided.

[codecov]

Codecov Report

Merging #1349 (4ce6b77) into master (e4adbe5) will increase coverage by 0.06%.
The diff coverage is 85.71%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1349      +/-   ##
==========================================
+ Coverage   70.24%   70.31%   +0.06%     
==========================================
  Files         351      351              
  Lines      111802   111809       +7     
==========================================
+ Hits        78539    78621      +82     
+ Misses      33263    33188      -75     

Files	Coverage Δ
src/QuadForm/Quad/ZLattices.jl	94.17% <85.71%> (+1.01%)	⬆️

... and 27 files with indirect coverage changes

[simonbrandhorst]

Thanks for taking care of this.