Remove useless voucher/token property, change "from" property to "uid" so it doesn't confilct with most sgbd and reflects that it is an user id and not an email, add utility methods and improve setter for expires.
Remove useless voucher/token property, change "from" property to "uid" so it doesn't confilct with most sgbd and reflects that it is an user id and not an email, add utility methods and improve setter for expires.


git-svn-id: 28fe03dfd74dd77dcc8ecfe99fabcec8eed81bba@2839 8555b757-d854-4b86-925a-82fd84c90ff4

Veredior/filesender,jornane/filesender,filesender/filesender,filesender/filesender,jornane/filesender,filesender/filesender,filesender/filesender,jornane/filesender,Emiel-Codebridge/filesender,Emiel-Codebridge/filesender,Emiel-Codebridge/filesender,Emiel-Codebridge/filesender,Veredior/filesender,Veredior/filesender,filesender/filesender,Veredior/filesender,jornane/filesender,Veredior/filesender