ENH: Config file templating

Paul McCarthyrequested to merge
(removed):enh/use-vars-in-config into master
  • Allow values to be injected into config files via Jinja2 templating
  • The Config class now raises an error on attempts to overwrite a configuration setting via Python attribute assignment (e.g. cfg.some_param = 10)
  • Change the Context class so that it sub-classes from Config, and a few associated changes

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