Signed-off-by: Kim Kulling <kim.kulling@googlemail.com>
These functions were added in C++11, and should not be used nakedly in the current code base. Replace them with suitable C++03 constructs.
The custom implementation for fast_atof currently lacks test coverage, making it susceptiple to regressions with future changes. Add some basic test coverage, in addition to a few documented cases that are known to fail.