correct function name
data version updated to mkl regression integration test files
Includes for other folders removed or shifted to .cpp
Merge pull request #2651 from srgnuclear/tincludes

Includes for other folders removed or shifted to .cpp #2557
Merge pull request #2644 from karlnapf/develop

mkl regression integration tests
Includes in preprocessor,multiclass,structure,distance,clustering either removed or trasnferred to .cpp file.
Merge pull request #2652 from srgnuclear/pincludes

Includes in preprocessor, multiclass, structure, distance, clustering either removed or transferred to .cpp file.
Move mean/linspace from SGVector to CStatistics/CMath respectively
Write Unit Tests for CStatistics::mean and CMath::linspace_vec