Code review comment for lp:~gary/z3c.recipe.filetemplate/support-system-python

Support the new zc.buildout 1.4.0+ include-site-packages option, and more.

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Features
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- Support the new zc.buildout 1.4.0+ include-site-packages option.

- Use the new zc.buildout 1.4.0+ path sorting algorithm, which puts
  site-package dependency paths after the other dependency paths (but before
  extra paths, as before). This can reduce or eliminate problems with
  packages in site-packages causing other dependencies to be masked with the
  versions in site-packages.

- Support escaping "$" with "$$" in templates. This is particularly useful
  for *NIX shell scripts.

- Support specifying local options in templates without braces (e.g.,
  "Hello $world" is now equivalent to "Hello ${world}".

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Fixes
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- Clarify that the recipe does not support the relative-paths options.

- Make tests less susceptible to timing errors.