url tag viewname should be treated as string-or-variable to allow dynamic viewnames

[jflatow@…]

I think the url tag should allow dynamic viewnames in the following way (dynamic_view_name is a context variable):

{% url dynamic_view_name args,kwargs=values %}

This means existing url tags will now be:

{% url "static_view_name" args,kwargs=values %}

[jflatow@…]

Patch to implement described behavior

[Johannes Dollinger]

See #10745 and #7917.

[James Bennett]

This is a straight-up duplicate of the above-mentioned tickets.