form elements do not need an id field
changed the way unchanged wiki commits are handled
removed the ids from the navbar items - highlighting now via custom tags
cleanup frontend test fixtures -> only forms now in use not complete pages
- re-enabled ids for form-fields as they provide useful in combination with
"for" attribute of labels
- refactored the form mixins
Merge pull request #692 from leider/master

cleanups in form components / frontendtests / wiki edit page