add sum of tumors subtyped by broad histology

[jharenza]

Purpose/implementation Section

What scientific question is your analysis addressing?

This relates to #1643 - I realized as going through the manuscript revisions that we don't have this explicitly calculated, so adding here.

What was your approach?

Summarized broad histology counts at a tumor level

What GitHub issue does your pull request address?

NA

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

Which areas should receive a particularly close look?

NA

Is there anything that you want to discuss further?

No

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

Yes

Results

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

Table printed within HTML

What is your summary of the results?

This is in the HTML now - code now prints this table for easy reference for Table 1 in results section sample counts.

Broad histology group	broad_hist_sum
Chordoma	6
Embryonal tumor	126
Ependymal tumor	33
High-grade glioma	141
Low-grade glioma	290
Mesenchymal non-meningothelial tumor	11
Neuronal and mixed neuronal-glial tumor	10
Tumor of sellar region	27

Reproducibility Checklist

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

Documentation Checklist

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

[jharenza]

@jaclyn-taroni this is ready - also updated Tables 1 and S1 to change Ependymal tumor --> Ependymoma