Use "streaming" mode in queries to reduce memory usage
Queries that look at, in particular lots of Jobs, pull down the whole query result into memory by default.
Since we are using Postgres in SqlAlchemy, we have the option to turn on "streaming" mode via
for the queries, so we read the query results a few at a time as we go, and use less memory.
Changes are in JobsPOMS.py, TriagePOMS.py in 5bed12c5