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Replace deprecated tbb::task_scheduler_init with tbb::task_arena

Timothée Couble requested to merge timothee.couble/vtk:smptools-tbb-initialize-update into master

The Initialize SMPTools TBB method for setting the number of threads had to be called before any other parallel operation and could only be set once. As tbb:task_scheduler_init was used in this method and is now deprecated, it is replace by tbb:task_arena. This new version let the user set the number of threads at anytime.

I did some Benchmarks before and after the changes on few .vtu datasets with 1, 2, 4 and 8 thread, and did not seems to affect runtime performances. (I used the vtkElevationFilter for the tests (500 executions))

@charles.gueunet

FYI: @will.schroeder @ben.boeckel

Please review: @mwestphal

Edited by Timothée Couble

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