(Bug #6020)

- Backups do not interfere with an atomic update (when possible).
- Backing up a file will remove a directory that is in the way
  and visa versa.
- Unify the backup-dir and non-backup-dir code in backup.c.
- Improved the backup tests a little bit.

This fixes an issue with -K noticed by eric casteleijn, avoids some
inconsistent itemizing when a file/dir is replaced by a dir/file,
and removes a now-obsolete chunk of code from make_file().

(see f41152d3), so remove the inaccurate
"p" from the man page.  Noticed by Jacob Balazer:

http://lists.samba.org/archive/rsync/2008-November/022022.html

as reported in bug 5851.

Gets rid of a DNS delay waiting for a lookup failure.

to a *-1 or *-2 directory.  A few other minor improvements.

- Mention how many files were created (protocol >= 29).
- Mention how many files were deleted (new in protocol 31).
- Follow the file-count, created-count, and deleted-count
  with a break-out list of each count by type.

a crash when the xattr pointer's memory happens to start out non-zero.
Also fixed the itemizing of an alt-dest file's xattrs when hard-linking.