ResamplingChi2 accepts as last parameter the level of parallelism to use:
- 0 => do not use threaded code
- >0 => use this number of threads (ie 1 is not really usefull
   unless you want to test the threaded code without real parallelism)

Note that this parameter is *OVERWRITTEN* by the
ALTREE_PARALLEL environment variable as soon as it is defined.

The random generator has been changed: the one from the system
was a real bottleneck.

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outer functions can choose to allocate memory
with malloc or on their stack

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ALTree/Chi2.pm contains stub to CUtils functions

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CamlCaseName for perl stubs
underscore_name for C functions

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Chi2 for double_permutation are computed separately

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TamuAnova => Math::TamuAnova
GSL::CDF => PDL::GSL::CDF


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For example, altree and ALTree can not be both existing
Now, altree is moved into progs/


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