more deagg --> disagg classes, comments, and docs

docs/pages/Building-&-Running.md

docs/pages/Functional-PSHA.md

etc/examples/6-enhanced-output/README.md

etc/examples/7-disaggregation/README.md

etc/examples/7-disaggregation/config.json

etc/examples/7-disaggregation/sites.geojson

etc/examples/8-probabilities/README.md

src/main/java/gov/usgs/earthquake/nshmp/DisaggCalc.java

src/main/java/gov/usgs/earthquake/nshmp/DisaggEpsilon.java

src/main/java/gov/usgs/earthquake/nshmp/RateCalc.java

...ov/usgs/earthquake/nshmp/www/DisaggEpsilonController.java

...s/earthquake/nshmp/www/services/DisaggEpsilonService.java

...a/gov/usgs/earthquake/nshmp/www/services/ServletUtil.java