Hide the welcome.msg for FTP users.

git-svn-id: http://svn.code.sf.net/p/openmediavault/code/trunk@1456 3c3d7b80-5828-415e-9f61-280b98178fff
* Certificate details UI improvement.
* Use SHA256 as message digest algorithm when creating self signed certificates via WebGUI.

git-svn-id: http://svn.code.sf.net/p/openmediavault/code/trunk@1457 3c3d7b80-5828-415e-9f61-280b98178fff