703 nf compute data frame

[forman]

This will close #703.

[JanisGailis]

Looks quite neat!

[codecov-io]

Codecov Report

Merging #711 into master will increase coverage by 0.2%.
The diff coverage is 95.08%.

@@            Coverage Diff            @@
##           master     #711     +/-   ##
=========================================
+ Coverage   76.65%   76.86%   +0.2%     
=========================================
  Files          81       81             
  Lines       12043    12151    +108     
=========================================
+ Hits         9232     9340    +108     
  Misses       2811     2811

Impacted Files	Coverage Δ
cate/ops/utility.py	84.41% <100%> (+0.63%)	⬆️
cate/ops/arithmetics.py	96.8% <94.73%> (-2.14%)	⬇️
cate/cli/main.py	64.47% <0%> (-0.13%)	⬇️
cate/ops/normalize.py	100% <0%> (ø)	⬆️
cate/util/monitor.py	93.4% <0%> (+0.5%)	⬆️
cate/core/opimpl.py	95.22% <0%> (+0.98%)	⬆️
cate/ops/io.py	84.66% <0%> (+1.01%)	⬆️

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[hans-permana]

Looks good!