templates/users: Converted registration form to Jinja2
templates/users: Converted club change page to Jinja2
templates: Converted error template to Jinja2
templates/generic: Converted forms to Jinja2
templates: Converted ranking pages to Jinja2
templates: Converted login form to Jinja2
templates/upload: Converted upload result page to Jinja2
templates/tracking: Converted tracking list to Jinja2
templates/tracking: Converted tracking detail pages to Jinja2
templates: Removed remaining unused Genshi templates
config: Changed default template renderer to Jinja2

.. and removed the Genshi renderer. Genshi remains as the renderer for
the toscawidgets until we upgrade to toscawidgets2, which supports Jinja2.