bit of a tidyup of crtl:

bit of a tidyup of crtl:
* code-comments for template-creation
* use "with open(xxx) as file" rather than explicit open-then-close
* use abspath on __file__ to get the relative position of the templates
  (makes it possible to run from locations other than current directory)
* add the module location to sys.path so as to be able to get at it
  (again even when running from locations other than cwd)