* Modified bin/BackupPC_dump to fix the case of a single partial

   backup followed by a successful incremental resulting in a full
   backup of level 1, rather than level 0.  Reported by Jeff
   Kosowsky.

 * Fixed BackupPC::PoolWrite to always create the parent directory.
   This fixed a case with rsync/rsyncd where a file like "-i" in the
   top-level directory sorts before ".", which meant the directory
   creation is after the file creation.  Also PoolWrite errors now
   increment xferError count.  Reported by Jeff Kosowsky.

 * BackupPC now gives a more useful error message if BackupPC_nightly
   takes more than 24 hours (ie: when the next one is meant to
   start).  Reported by Tony Schreiner.