Switch to panic='abort' for safety across FFI boundaries

[ValarDragon]

Thanks to @daira for pointing out the security impact, and @jon-chuang for raising the issue / pointing out perf improvements.

This still needs to be done in downstream repositories, as this change only applies to the top level crate.

closes: #183

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[Pratyush]

Doesn’t this only affect our libraries, and not any downstream binaries?

[ValarDragon]

Yes. my understanding of the profile docs is that this will only take precedence for FFI that is obtained from compiling algebra directly. (E.g. golang code using FFI for this curve arithmetic, and implementing BLS with it)

I don't think this is a big concern for algebra, but is much more likely to be one for groth16, and it doesn't really hurt to do it in all libraries.