* Resynchronise with Debian. Remaining changes: - Ubiquity integration: If PARTMAN_NO_COMMIT is set, then exit rather than running commit.d and finish.d scripts; add a partman-commit script; dump extra information to /var/lib/partman/snoop if PARTMAN_SNOOP is set. - Don't skip over dmraid devices if the user chooses not to activate them. - If the only thing mounted on a disk is the installation medium and it uses more or less the whole disk, then silently exclude that disk; if the installation medium is mounted but doesn't use the whole disk, issue a warning that partitioning may be difficult; if anything else is mounted, offer to unmount it. partman/filter_mounted=false disables this. - Use ext4 as the default filesystem for new partitions.