- While using the rescue CDROM after my computer would not

- While using the rescue CDROM after my computer would not
  boot, I realized that it would be very useful to have
  a umount_disks. So, it is not implemented, along with
  updates to the READMEs and some minor tweaks.
- Moved mounting the CDROM in the rescue boot from /cdrom
  to /mnt/cdrom (more standard location).
- Reboot in CDROM rescue should now work -- requires -d
  option (no write) to work.
- Hopefully fixed all the IPV6/4 problems and buffer
  problems with networking in lib. Bugs 190 and 204.
  Cleaned up a lot of #ifdefing problems by using routines
  in address_conf.c

git-svn-id: https://bacula.svn.sourceforge.net/svnroot/bacula/trunk@1763 91ce42f0-d328-0410-95d8-f526ca767f89