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gdaldem: syncing all datatypes to 64-bit float for faster shading on 64bit machines #53
@rouault should I not change whitespace at all, or separate it into a "tidying" commit?
As for further profiling, one of the slowest parts now is ARE_REAL_EQUAL define, which probably should be rewritten into something like AlmostEqual2sComplement from http://www.cygnus-software.com/papers/comparingfloats/comparingfloats.htm (but I lack skills to make it polymorphic for both float and double in current code layout).