Ignore .R.stderr files in build diffing
approved new build after reviewing with Malachi

There were several causes of changes:

- Some files were added in: 9bb4d83 ClinSeq - generate clonality plots test now takes ~60s instead of ~1400s to run, other minor fixes
- Some paths change due to rebuild of upstream models, e.g. tumor_rnaseq_build
- Some floating point changes/error that correlated very strongly with previous.
- Several log files were removed and are now inline.