Chart generation fixes for v38.1
I found 3 problems when building the charts.
1. The CLDR delta_summary.tsv shows unexpected results
I looked into it, and the v38.1 data is correct, but the delta chart building is picking probably up trunk (which has an annotations/root.xml with the special values for the survey tool)
2. There are spurious differences in deltas for af.html
The change in root is expected, but the subdivisions changes are bogus. Probably due to those three being in the main files.
3. I needed made two changes to get the generation for v38.1.
Splitting out part that was done, with the rest for v40.