Remove `static` and `interactive` flags

[michaelweylandt]

The static and iteractive flags to CARP and CBASS were originally added to speed up fitting for cases when plotting would not be needed. If we can make these calculations cheap (vs. the actual clustering), there's no reason to have these flags and we can simplify the code base significantly.

Now (2018-09-12), the remaining culprit appears to be the PCA-projection in CARP (used to visualize cluster paths).

[michaelweylandt]

After merging #18, there are no more significant bottlenecks in the visualization-related code.