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PerfTestUtils: compile with or without MPI.

testFMpiFmaDivider: changed according to said correction

Development and test programs for MPI pre-balancing.

PerfTest: added MPI
PerfTestUtils: added FMpi to the program parameters

AlgoLoaderThreadProc: corrected FMpi use
TreeLoaderMpiGeneric: created file
TreeLoaderMpiGenericFCheb: created file

The FMpi class initializes and destroys the MPI context. A counter has
  been added to prevent more that one instanciation. When this happens,
  a std::logic_error is thown.

FMpiFmaDivider: add a dispatch policy choice  (count boxes or particles).
FMpiFmaDivider: add a constructor to choose output basename and extention.

testFMpiFmaDivider: update to support aforementioned changes.
testFMpiFmaDividerArgs: created to support aforementioned changes.

 - All auxiliary files were moved the new PerfTest folder.

 - Created TreeLoaderBasic : a basic version of the tree loader.
 - Changed TreeLoaderFCheb to inherit from TreeLoaderBasic.
 - Created TreeLoaderMpiSplit to load splitted FMA files.
 - Created TreeLoaderMpiSplitFCheb to load files for Chebychev interpolation.

 - Created AlgoLoaderThreadProc which loads the MPI thread algorithm.

This class is a wrapper arround an FFmaGenericLoader that behaves as a
  FMpiFmaGenericLoader.

FMpiFmaDivider: This class is meant to split an FMA file into balanced
  smaller sub-files. Each sub-file is a stand-alone FMA file of its own
  that can be loaded with the FFmaGenericLoader. A main sub-file is also
  created. It can be used to retrive the total number of particles among
  the files.

testFMpiFmaDivider: renamed from testFMPIParticleDivider

Removed some warnings; Provided exponential eval in double and single precision; Fixed some maths functions.