Windows: update to libquantlib 1.16

[jeroen]

This took an unholy amount of time so I hope you appreciate it. Updates quantlib on Windows to the latest 1.16 and adds support the forthcoming GCC 8+ toolchain.

Output from winbuilder:

• https://win-builder.r-project.org/7EPd7OQI6oBS/
• https://win-builder.r-project.org/g4w61c4hMDnu

If you can submit this before CRAN closes shop for the toolchain migration, that would be fantastic.

[eddelbuettel]

I surely do! Thanks for doing this.

[eddelbuettel]

By now my PPA has caught up so I have 1.16 myself now; no change needed for RQuantLib -- that is always good to know.

I may toss in a quick swap of tinytest for RUnit and should then be ready to call it 0.4.10 and throw it at CRAN before they close. We have a clean slate there so should be easy.

[eddelbuettel]

Come to think about it then I'd need r-cran-tinytest in Debian now as well so I may hold off on that.

(But still ship to CRAN)