v2.0.0RC8

The 2.x series of LocARNA introduces several improvements that make LocARNA faster and easier to use. Most prominently, it features a novel sequence envelope heuristic in all major alignment modes, which significantly improves over less sophisticated banding heuristics (in terms of speed, robustness, /and/ flexibility). Most directly notable for users, it changes the default parameters to more appropriate settings. In addition too various detailed improvements of the locarna tools, there are significant changes under the hood: the C++-code of the LocARNA library was simplified and modernized making use of C++-14 features. These changes make the library easier to use, maintain and extend.