create separate scripts for plotting interaction vs. additive coxph models (1/N)

[rjcorb]

… update script paths

Purpose/implementation Section

What scientific question is your analysis addressing?

Closes #60. This PR creates two separate survival model scripts for plotting additive vs. interaction coxph models, and updates file paths to use appropriate functions in analysis modules (additive in survival, interaction in braf-fusions).

What was your approach?

What GitHub issue does your pull request address?

#60

Directions for reviewers. Tell potential reviewers what kind of feedback you are

soliciting.

Which areas should receive a particularly close look?

Is there anything that you want to discuss further?

Is the analysis in a mature enough form that the resulting figure(s) and/or table(s) are

ready for review?

Results

What types of results are included (e.g., table, figure)?

What is your summary of the results?

Reproducibility Checklist

• The dependencies required to run the code in this pull request have been added to the
  project Dockerfile.
• This analysis has been added to continuous integration.

Documentation Checklist

• This analysis module has a README and it is up to date.
• This analysis is recorded in the table in analyses/README.md and the entry is up to
  date.
• The analytical code is documented and contains comments.

[jharenza]

works, no changes in output