* 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. - Close all file descriptors other than 0, 1, and 2 on startup, so that we don't hold a pipe to debconf open. - Use GPT label by default on Intel Macs. - Add support for /lib/partman/check.d scripts, intended to contain sanity checks run before changes are committed. (These checks were formerly typically in /lib/partman/finish.d.) - Use MS-DOS label by default on PS3 systems. - Add an IS_BUSY command to check whether a partition is busy (i.e. mounted).