[Developers] Adding C/C++ indexing functions for vector grid variables

[Erik Schnetter]

Add functions CCTK_VectGF1D, CCTK_VectGF2D etc. and the corresponding 
macros CCTK_VECTGFINDEX1D etc. that allow indexing into vector grid 
variables.  Vector grid variables require an additional index, namely 
the vector index.

-erik

-- 
Erik Schnetter <schnetter at cct.lsu.edu>   
http://www.cct.lsu.edu/~eschnett/




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