MFC r267355:
  Add UUIDs for DragonFlyBSD's partition types.

MFC r267356:
  Add DragonFlyBSD's Hammer FS types and type names.

MFC r267357:
  Add aliases for DragonFlyBSD's partition types.

MFC r267358:
  Allow dumping to DragonFlyBSD's swap partition.

MFC r267359:
  Add disklabel64 support to GEOM_PART class.

  This partitioning scheme is used in DragonFlyBSD. It is similar to
  BSD disklabel, but has the following improvements:
  * metadata has own dedicated place and isn't accessible through partitions;
  * all offsets are 64-bit;
  * supports 16 partitions by default (has reserved place for more);
  * has reserved place for backup label (but not yet implemented);
  * has UUIDs for partitions and partition types;

MFC r267360:
  Add disklabel64 support

Relnotes:	yes