Simpler row/col length using row/colrange

[jishnub]

colrange and rowrange should be empty (i.e. having a length of 0) if there is no value in the column/row, so the max will be implicit.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.76%. Comparing base (13b11fc) to head (da4b4d3).
Report is 8 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #433      +/-   ##
==========================================
- Coverage   89.59%   87.76%   -1.84%     
==========================================
  Files          25       23       -2     
  Lines        3557     3130     -427     
==========================================
- Hits         3187     2747     -440     
- Misses        370      383      +13     

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