MSVC Fix

[James-E-A]

For some reason, Microsoft's compiler doesn't seem to infer these overloads correctly. This patch allows successful compilation of v0.13.1.

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[jmr]

using std::abs; etc would be more consistent with the current coding style. Does that work?

[jmr]

Also, there are conflicts that need to be resolved.

[jmr]

Does #555 work for you?

[James-E-A]

I've been very busy with other projects recently; my feelings won't be hurt at all if someone beats me to the punch on figuring out how to translate this patch from v0.13.1 — which is still the latest release! Is there any possibility of doing a .2 bump with just this patch? — to whatever's going on on master. If not, I expect to have this checked out again by mid-April.

And RE using std::abs; I am also not familiar with this codebase or C++ generally; if there's alleged a prettier alternative fix, I have nothing to say in defense of my own original approach.