Template globals might be leaking between threads

[jodal]

I'm not entirely certain about this, but since I have a hunch this is causing the issues I'm seeing and the consequences might be serious, I want to report it sooner rather than later.

Looking at issue #89 and PR #90 where collected CSS and JS leaks from one template render to another, I suspect the same happens to Catalog._tmpl_globals, which has exactly the same usage pattern as collected_css and collected_js.

If one uses the template globals to pass e.g. the request object to components, this can cause serious issues, where templates are rendered based on the request objects belonging to different users.

[jpsca]

It was. Thank you for the report. It's fixed in the latest release