Release SCS 2.0.0. This includes several changes, most notably:
* Add an acceleration outer loop, this dramatically improves performance on most problems (that we tested).
* Acceleration requires LAPACK, so this is now linked against by default (instead of optionally as before).
* Since acceleration improves performance we have tightened to default tolerance from 1e-3 -> 1e-5, and also increased the default max number of iterations from 2500 -> 5000.
* Break out the interfaces for other languages to different repos.
* Add some C testing capabilities.
* Some internal renaming of functions and variables