Quick fixes for <gsl-lite/gsl-lite.hpp>; cosmetic changes #226
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By assuming that signed integers use two's complement representation, we rewrite the bounds check as an unsigned comparison, which both avoids the NVCC's warning about comparing unsigned numbers to 0 and saves one comparison. Fixes gsl-lite#223.
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The suggested use of namespace aliases in libraries using gsl-lite leads to warnings with some older compilers, so we explicitly refer to
::gslinside the library.Also, cherry-pick the CUDA-related fixes from #225.