- Add support for using swap backed md(4) devices for building the   disk image.  In some cases this can be a significant speed-up, if   most of the image can be kept in RAM while being populated.
- Add support for using swap backed md(4) devices for building the
  disk image.  In some cases this can be a significant speed-up, if
  most of the image can be kept in RAM while being populated.

  On the 2GB image I'm currently working with, the build time,
  excluding buildworld/buildkernel, goes from ~17 minutes to ~6
  minutes.

  This is not enabled by default, as it might have the opposite effect
  on low-memory systems.

- During the generation of the image file be a bit more verbose in the
  log file so it is possible to see what's being done.

- Add a NANO_DISKIMGDIR variable which makes it possibly to place the
  final images somewhere other than ${MAKEOBJDIRPREFIX}.  The default
  value for NANO_DISKIMGDIR is $MAKEOBJDIRPREFIX.

Go for it:	phk

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