Add a redirection switch for download and details view when no view given.

Redirect users without any modifying permissions (without editable border)
to the download when not hitting a specific view.
Also add File back to allowAnonymousViewAbout for making sure that /view
is added in the navigation.
Merge pull request #14 from 4teamwork/jone-13-file-view-download

Add a redirection switch for download and details view when no view given