When deleting the final partition, truncate it to match media size.
Also handle creating new partitions beyond the existing partitions
if it is still within the media size.
when setting Apple_UNIX_SVR2.
Correctly update dpme flags when partition is changed to Apple_HFS
Properly reread Apple_HFS volume name when partition is changed to Apple_HFS
update man page to reflect new functionality
document t command in man page
