[ckan-dev] cleaning helpers

[Toby Dacre]

Hi,

I've been doing some cleanups to remove unused functions from h passed to
templates.

There is now a new config option `ckan.restrict_template_vars` if this is
set it will only allow a restricted set of functions.  Also functions that
required c to be passed eg h.nav_link() no longer accept this and should be
called without c as a parameter (will raise an exception).

If not set then we are all as usual and functions like nav_link() can be
called with or without c being passed.

This means we can start transitioning to a cleaner setup without breaking
existing templates etc but we can also test the strict new rules.

the allowed functions are in lib/helpers_clean.py (and yes I have done a
from ... import ...) I would like to see us transition to forcing using
cleaner template vars as soon as practical.

this is merged into master

cheers
Toby
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