Merge branch 'DataSetFoldImplementations' into 'master'

provide specific fold instances for Data.Set to improve performance

See merge request !254
2 jobs for master in 3 minutes and 52 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Test
passed #54045
test-nightly

00:02:00

failed #54046
allowed to fail
test-stable

00:01:52

 
Name Stage Failure
failed
test-stable Test
Compiling System.TTS
Compiling System.Time.GenJSON
Compiling System.Signal
Compiling System._Signal
Compiling System.Socket
make: *** [test] Error 1
Makefile:24: recipe for target 'test' failed
make: Leaving directory '/builds/clean-and-itasks/clean-platform/tests/linux64'
ERROR: Job failed: exit code 1