Add an option for enabling floating point exceptions

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Issue #961 new
Ian Hinder created an issue

Cactus disables floating point exceptions, so that NaNs and Infs can be generated by numerical code. When debugging, it is sometimes very helpful to use these exceptions, as a debugger will tell you exactly which piece of code generates them.

I propose that Cactus should have a run-time parameter, defaulting to "no", which enables floating point exceptions.

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