Sync with Debian svn r21839 based on 3.16.2-3
Update sync-helper.sh for new kernel version with additional files
Add patch fixing ext4 readonly handling

Credits to Maxim Suhanov <no.spam.c@mail.ru>
Release new version 3.16.2-3+grml.1
Update linux-meta-grml package for new kernel release 3.16-1
Release new linux-meta-grml package version 3.16-1+grml.1