[CMake] Using relative paths with INSTALL

[Timothy M. Shead]

We're going off on a tangent here, so I'll restate my question.  Forget 
the context.  If I write

   INSTALL(FILES foo DESTINATION ../bar)

... it works fine today.  Will it work in the future?  Is it guaranteed 
to work on all platforms?  I ask because I recognize that it is an 
unusual use-case.

Many thanks,
Tim

-- 
Timothy M. Shead
Data Analysis & Visualization (1424)
Sandia National Laboratories
505-284-0139