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Speed up string to real #498

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@jacobwilliams

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@jacobwilliams

See the discussions here and here. There is a lot of room for improvement in the string to real parsing (which is currently using read(fmt=*) which is apparently quite slow.

The C strtod routine is much faster. Could add it as an option, or maybe even the default. Is it a guarantee that every Fortran compiler will have this? Seems to be true for Gfortran and Intel.

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