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Don't define Dimension for groups #43

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These attributes were misleading: the "dimension" of a groups is not normally defined as the dimension of some space it acts on (here: the dimension of the projective space plus 1 is used, i.e. "the size of the matrices" to quote a code comment).

I don't expect this PR will work in its current form (in particular I did not try to adjust any examples yet). It is of course also rather radical in that it just removes the code. It could instead just rename the attributes, or do something yet different. I mostly wanted this as a starting point for a possible discussion on what to do.

These attributes were misleading: the "dimension" of a groups is not
normally defined as the dimension of some space it acts on (here: the
dimension of the projective space plus 1 is used, i.e. "the size of the
matrices" to quote a code comment).
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codecov bot commented Oct 18, 2023

Codecov Report

Merging #43 (9cebb0b) into master (91cb3b0) will decrease coverage by 0.11%.
The diff coverage is 75.00%.

@@            Coverage Diff             @@
##           master      #43      +/-   ##
==========================================
- Coverage   47.61%   47.51%   -0.11%     
==========================================
  Files          34       34              
  Lines       17906    17878      -28     
==========================================
- Hits         8526     8494      -32     
- Misses       9380     9384       +4     
Files Coverage Δ
lib/correlations.gd 100.00% <ø> (ø)
lib/group.gd 97.59% <ø> (-0.03%) ⬇️
lib/group.gi 63.26% <100.00%> (-0.08%) ⬇️
lib/correlations.gi 45.26% <0.00%> (+0.16%) ⬆️

... and 1 file with indirect coverage changes

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