[MRG] OpenMP support (#260)

* Added : OpenMP support
Restored : Epsilon and Debug mode
Replaced : parmap => multiprocessing is now replace by multithreading

* Commit clean up

* Number of CPUs correctly calculated on SLURM clusters

* Corrected number of processes for cluster slurm

* Mistake corrected

* parmap is now deprecated

* Now a different solver is used depending on the requested number of threads

* Tiny mistake corrected

* Folders are now in the ot library instead of at the root

* Helpers is now correctly placed

* Attempt to make compilation work smoothly

* OS compatible path

* NumThreads now defaults to 1

* Better flags

* Mistake corrected in case of OpenMP unavailability

* Revert OpenMP flags modification, which do not compile on Windows

* Test helper functions

* Helpers comments

* Documentation update

* File title corrected

* Warning no longer using print

* Last attempt for macos compilation

* pls work

* atempt

* solving a type error

* TypeError OpenMP

* Compilation finally working on Windows

* Bug solve, number of threads now correctly selected

* 64 bits solver to avoid overflows for bigger problems

* 64 bits EMD corrected

Co-authored-by: kguerda-idris <ssos023@jean-zay3.idris.fr>
Co-authored-by: ncassereau-idris <84033440+ncassereau-idris@users.noreply.github.com>
Co-authored-by: ncassereau <nathan.cassereau@idris.fr>
Co-authored-by: Rémi Flamary <remi.flamary@gmail.com>

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