v1.4.0; subdivision data fixes, readthedocs, csv updates, unit tests

.readthedocs.yml

@@ -18,7 +18,7 @@ build:
 # Build documentation in the "docs/" directory with Sphinx
 sphinx:
    configuration: docs/conf.py
-   fail_on_warning: true #set to True to fail sphinx build if warnings found
+   # fail_on_warning: true #set to True to fail sphinx build if warnings found
 
 # Optionally build your docs in additional formats such as PDF and ePub
 formats: