If a symlink, device, special-file, or hard-linked file is replacing
an existing non-directory, the new file is created using a temporary
filename and then renamed into place.  Also changed the handling of
a cluster of hard-linked symlinks/devices/special-files to always
ensure the first item in the cluster is correct, since it doesn't
really save any significant work to try to find an existing correct
item later in the cluster to link with.

Fixes bug 6569.

Inspired by the patch to bug 6633.

Patch from Tim Spriggs.

writing a batch file.

for each file given on the command-line.

that is based on the master in the new "based-on:" line.

- Improve function name: parse_rule -> parse_filter_str (to make the
  similarity with parse_filter_file clearer, and better indicate that
  it can parse multiple rules when FILTRULE_WORD_SPLIT is specified).

- In preparation for rule prefixes containing information beyond the
  rflags, change the code to pass around a full "template" filter_rule
  instead of just rflags.  Callers of parse_filter_{str,file} that want
  to specify only rflags can use rule_template(rflags) .

- Remove the MODIFIERS_* strings and instead hand-code the condition
  under which each modifier is valid.  This should make it easier to
  see that the conditions are correct.

- Tighten up default modifiers on merge rules:
  - Disallow "!" because it isn't useful.
  - If the merge rule specifies a side via "s" or "r", the rules in the
    file cannot also specify a side via "s", "r", "hide", etc.

[Patch was changed by Wayne a bit prior to application.]

function for the latter, it will always exist).

to {user,group}_to_*().  Based on a patch by Matt McCutchen.

in the man page.

Since the value is not needed, protocol 31 no longer sends it, while
older protocols are optimized so the sender just sends a valid rdev
value as efficiently as possible.  The receiver no longer caches an
rdev value for special files, and the generator will always pass a 0
rdev value to do_mknod() for special files. Fixes bug #6280.

in the strncasecmp() of OpenSUSE 10.2 (x86_64).

dir.

- Changed get_backup_name() to verify the backup path, and make any
  missing directories.  This avoids accidental use of a symlink as a dir
  in a backup path, and gets rid of any other non-dirs that are in the
  way.  It also avoids the need for various operations to retry after
  calling make_bak_dir(), simplifying several pices of code.
- Changed create_directory_path() to make_path(), giving it flags that
  lets the caller decide if it should skip a leading slash or drop the
  trailing filename.
- Mention when we create the backup directory, so the user is not caught
  unaware when rsync uses a directory they didn't expect.
- Got rid of some dir-moving backup code that is not used.
- Added a little more backup-debug output.

if hard-linking fails.