Weighted bases for num arrays 177776376

[ernestoarbitrio]

Features:
2 new per cell measures for aggregates:

• Valid counts unweighted
• Valid counts weighted
  These 2 measures are now available at the partition level and have to be included in the exports

Refactoring:
Move columns_base from old CubeResultMatrix to the new architecture AKA Assembler

[codecov]

Codecov Report

Merging #279 (2ee123b) into master (4705ad8) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##            master      #279    +/-   ##
==========================================
  Coverage   100.00%   100.00%            
==========================================
  Files           20        20            
  Lines         3955      4149   +194     
==========================================
+ Hits          3955      4149   +194     

Impacted Files	Coverage Δ
src/cr/cube/cube.py	100.00% <100.00%> (ø)
src/cr/cube/cubepart.py	100.00% <100.00%> (ø)
src/cr/cube/enums.py	100.00% <100.00%> (ø)
src/cr/cube/matrix/assembler.py	100.00% <100.00%> (ø)
src/cr/cube/matrix/cubemeasure.py	100.00% <100.00%> (ø)
src/cr/cube/matrix/measure.py	100.00% <100.00%> (ø)
src/cr/cube/stripe/assembler.py	100.00% <100.00%> (ø)
src/cr/cube/stripe/cubemeasure.py	100.00% <100.00%> (ø)
src/cr/cube/stripe/measure.py	100.00% <100.00%> (ø)

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