* Allow to redirect to referrer page when access is denied
* Logout user and point towards login, add redirect
* Logout user as usual but added save redirects
* Adjusted templates and page codes
This will remove any template content related to the trade currency if
that one is left empty in the configuration.
While going through the templates I also cleaned up the PHP Warnings
left. The code and templates should now process without throwing any PHP
warnings.
Fixes#305 and further addresses #301