Tidy things up for a data fetcher interface. #228
Merged
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This is a small tidy-up to move a bunch of Jinja2 specific code into a module. The idea is that we can start separating the parts of the code which are specific to PostgreSQL from the general parts using the
DataFetcher
interface. Then we can implement additional things conforming toDataFetcher
, such as RAWR tiles.