Rename addSPartitioning -> prePartition

[JulienPeloton]

Rename addSPartitioning -> prePartition

[codecov-io]

Codecov Report

Merging #113 into master will not change coverage.
The diff coverage is 100%.

@@          Coverage Diff           @@
##           master    #113   +/-   ##
======================================
  Coverage    90.8%   90.8%           
======================================
  Files          33      33           
  Lines        1229    1229           
  Branches      202     202           
======================================
  Hits         1116    1116           
  Misses        113     113

Flag	Coverage Δ
#python	93.65% <ø> (ø)	⬆️
#scala	89.54% <100%> (ø)	⬆️

Impacted Files	Coverage Δ
src/main/scala/com/spark3d/Repartitioning.scala	80.43% <ø> (ø)	⬆️
src/main/scala/com/spark3d/package.scala	100% <100%> (ø)	⬆️

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