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* Update serial_tree_learner.cpp

* Update src/treelearner/serial_tree_learner.cpp

* stable multi-threading reduction

* Update src/treelearner/serial_tree_learner.cpp

* more fixes

* Apply suggestions from code review

* Apply suggestions from code review

* Update src/boosting/gbdt.cpp

This reverts commit 656d2676.

* only one fix

* add more

* add more

* don't cache `num_thread`, to avoid change outside

* rename

* update document

* Update docs/Parameters.rst

* Update include/LightGBM/config.h

* Apply suggestions from code review
Co-Authored-By: Nikita Titov <nekit94-08@mail.ru>

* Apply suggestions from code review
Co-Authored-By: Nikita Titov <nekit94-08@mail.ru>
Co-authored-by: Nikita Titov <nekit94-08@mail.ru>

* fix bagging

* fixed cpplint issues

* updated docs
Co-authored-by: Nikita Titov <nekit94-08@mail.ru>

* some refines

* more omp refactoring

* format define

* fix merge bug

* some fixes

* fix some warnings

* Apply suggestions from code review

* Apply suggestions from code review

* remove dup codes

* added all necessary includes - fixed build/include_what_you_use error

* fixed the order of includes (build/include_order)

* Added possibility to compile without openmp (useful for clang on Mac)

* Added CMake option to create dylib on MacOS