Changed test do testing as unittest and setting them up correctly.
More use of render arrays.

No calling of theme() which is a no go according to Drupal API:
https://api.drupal.org/api/drupal/includes!theme.inc/function/theme/7
Template updated to use render arrays and add a tabs-sections-wrapper.
Section wrapper is now wrapping section.
Removed unused function worktabs_render_content().
Change button text when tab content is empty.
Change of api for worktabs.
Add update hook to enable translatable module.
Really nice that spelling errors are not detected.
Merge branch 'feature/1252-no_clicking_for_missing_material_review' into develop