Random-survival-forest

- Fix bugs
- Timeline is needed again

* IMPORTANT bug fix:

* predict() did not work properly for new data. OOB data was predicted correct

* Remove timeline parameter, as it is not really needed here

- Bug fix:
- Some trees could not be used for prediction, which resulted in an error.
- These trees are ignored now

- Remove unnecessary prints

- Fix random state bug that caused each tree to be equal.