* Resynchronise with Debian. Remaining changes: - user-params: Don't propagate vga=*, break=*, *-ubiquity, or noninteractive to installed system. - Use /proc/self/fd/4 rather than /dev/fd/4 in fetch-url-methods/http; the latter doesn't seem to exist in d-i. - list-devices: new "mmc-partition" type for detecting partitions on MMC devices. - Don't include the battery subsystem on calls to udevadm trigger.