use 'cataracts' instead of 'cataract'
Rename symptoms to problems
Spelling
Aravind facilities use health_utility and health_problems
Analyze health utility instead of eye health
Do filtering directly in health.py

Necessary because different facilities can do different things
Make it easy to treat health problems as a list
Run new health utility based approach
Merge remote-tracking branch 'upstream/master'
adjusted rvs mean to get pure mean for truncated distribution