[1225] Theme tool - added bigramsn and trigrams.
[xs] Fix link for redirect when not linked in - the initial slash is not liked by Drupal.
[1225] Theme tool - more tweaks
[1225] Theme tool - made it callable from the main CKAN code.
[1225] Theme tool - made it more callable from e.g. ckanext-harvest.
Merge branch '903-redesign' of github.com:datagovuk/ckanext-dgu into 903-redesign
[1225] Theme tool - Add writing of the new categories.