[Developers] Define CCTK_*_PRECISION macros

[Erik Schnetter]

Define macros CCTK_{INT,REAL,COMPLEX}_PRECISION to values of 1, 2, 4,  
8, 16, or 32, depending on the definition of the default data types  
CCTK_{INT,REAL,COMPLEX}.  Currently, one has to explicitly test  
whether e.g. a macro CCTK_REAL_PRECISION_8 is defined to find out  
whether CCTK_REAL is equivalent to CCTK_REAL8.  These new macros make  
type generic code more convenient to write.

-erik

-- 
Erik Schnetter <schnetter at cct.lsu.edu>

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