Rewrite logging

[NHellFire]

Logging to disk:

• Should be rewritten to attempt mounting each filesystem to check for a DBANLOG directory.
  Will allow saving logs to all attached devices (as long as you have manually created the directory first), not just FAT filesystems.

Logging to network:

• Use avahi to autodiscover log server
  Will need to write a howto for setting this up.
• Add support for additional protocols? FTP?
  Could use avahi-publish-service and avahi-resolve-service to specify what is available.