Update model.php

Bugfix: getByTags not working (backend)

Faq records with the tag added did not show in the list of used tags.

How to simulate problem?
- Add a tag to a faq question
- Goto Backend > Modules > Tags > [select tag] > Edit
- The faq question is not listed
Merge remote-tracking branch 'forkcms/master'
Merge remote-tracking branch 'origin/master'

Conflicts:
	backend/modules/faq/engine/model.php
cleanup unneeded file (wako merge)
Fix: spinner.gif image cannot be loaded

When going to this backend page: /private/nl/settings/email
you will find that the spinner.gif image cannot be loaded.
Fix: ds.png image cannot be loaded

When going to this backend page: /private/nl/form_builder/edit?token=xxxxxxxxx&id=1
you will find that the ds.png image cannot be loaded.
Fix: favicon.ico cannot be loaded

When going to this page: /src/Api/V1/docs/index.htm
you will find that the favicon.ico cannot be loaded.
The default frontend theme (when chosing no theme in backend) could not load the Head.tpl and Footer.tpl.
Merge pull request #780 from bart-lysander/url-fixes

Some small url fixes