Squashed commit of the following:

commit 7e875ff47ae1a3e546c74fb12895b2bfbeedabdf
Author: Thomas Müller <thomas.mueller@tmit.eu>
Date:   Sun Jul 14 21:58:08 2013 +0200

    No admin option to enable public upload in case encryption is enabled
    No upload on pubic page if public upload is disabled

commit 4939d9a668c13cdd74e8bb8e305bdd7a59661c4d
Author: Thomas Mueller <thomas.mueller@tmit.eu>
Date:   Fri Jul 12 21:34:38 2013 +0200

    change anonymous to public

commit c3bda8654d911383ae0acf9e41adda7117cb79f8
Author: Thomas Müller <thomas.mueller@tmit.eu>
Date:   Fri Jul 12 17:51:01 2013 +0200

    fixing Undefined index: publicUploadEnabled

commit 98861afde443c12a2ef5290c83c63fd12b7b196d
Author: Thomas Müller <thomas.mueller@tmit.eu>
Date:   Fri Jul 12 17:05:58 2013 +0200

    in case the encryption app is enabled we cannot yet allow anonymous upload

commit 974f09629d0e8bf5d90cf8546fa4a82738ebdebe
Author: Thomas Müller <thomas.mueller@tmit.eu>
Date:   Fri Jul 12 17:03:51 2013 +0200

    new admin setting added which allows to turn off anonymous uploads