Replace kind=8 with iso_fortran_env kinds #665
Merged
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This patch replaces references to kind=8 with the corresponding Fortran kind identifiers as defined in iso_fortran_env.
Although these are widely equal to 8, there are a number of compilers (notably NAG, also others) which set it to a different value.
This improves the portability of the code (albeit in a rather minor way).