[GRASS5] values.h changed to limits.h

[Eric G . Miller]

<limits.h> is a standard C header *and* every conforming system must
provide it.  It only has to have system macros for character and integer
types. <float.h> provides ranges for floating point types.  Both are
ISO C.  So, if there's an issue it's with any system that still doesn't
support an 11 year old standard ;)

-- 
Eric G. Miller <egm2 at jps.net>

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