[fix] Etc, error layouts
[fix] Error messages, renderer ref
Default logged_in policy
Context processors integration
User groups default ctx processor
Include ctx processors data in layouts
Policies, support passing policy names among sets
Added www. policies

* Redirect to www. version of domain
* Redirecto to no-www. version of domain
Use domain layout in config
Forms, jade version
Jade renderer, pass system errors

* Jade renderer lets system errors bubble up
Templates, wrapper, ctx name

* Template name is passed to the template context
* Template output is wrapped inside div
Permission model

* Added abstract model that implements permission queries
Text, idents

* Added unique idents for better text fetching
Default comm fconfig
Layout module

* Added module that manages slots while rendering
Permission model, default config
User perms, additional attrs
Perm model, ask database