Update braf-fusion survival analyses with interaction models

[rjcorb]

Purpose/implementation Section

What scientific question is your analysis addressing?

What was your approach?

What GitHub issue does your pull request address?

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

soliciting.

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

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Results

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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]

this reproduces and looks good to me!