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                       File name conventions
		          (J.Pety, 2003)

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   gbl_ is the new prefix of global include files (i.e. include files of
   the kernel/include directory).

   Compilable sources:

      .inc    suffix of include files (.par and .pat are special kind of include files)
      .f      suffix of almost FORTRAN 77 files (in particular fixed format)
      .f90    suffix of FORTRAN 90 files

   Sources that must be pre-processed (by cpp) to obtain compilable files

      .incpp  suffix of include files that always must be pre-processed (idem for .parpp and .patpp)
      .f90pp  suffix of FORTRAN 90 files that always must be pre-processed
      .fpp    suffix of almost FORTRAN 77 files that always must be pre-processed

   Pre-processing scheme:

      .incpp -cpp-> .inc  (idem for .parpp and .patpp)
      .f90pp -cpp-> .f90
      .fpp   -cpp-> .f

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