try to turn off unused-parameter compiler warnings.

the FLAG_SKIP_HLINK flag, which gets set on any hard-linked file that
the user wants to skip (e.g. via --ignore-existing, --append, etc.).
The code in hlink.c now deals with the skipped files instead of
triggering an assert() error.

still get their non-content attributes updated, and combining --append
with --hard-links will not prevent the discovery of unchanged files.

a dir/symlink/device/special-file, just like it already refuses to
overwrite a non-regular file with a regular file.

while requesting a file-listing and we suspect that the remote rsync
is complaining about the -d option.

  create a directory in the backup-path area.
- Fixed a bug where make_file() was setting F_PATHNAME() on the
  receiving side.
- A non-pool (temp-memory) file structure now stores the size of
  its extra_cnt value in the F_DEPTH() int so that unmake_file()
  can always be sure of how to free() the memory.
- The ACL-preserving code no longer allocates 4 more bytes per
  file entry than it needs.
- Got rid of a useless adding of the symlink length to "bp".

(rather than /usr/include/popt.h), and use the included popt lib
if it is (to avoid a potential conflict due to our use of -I.).

when talking to older rsync versions.

  the client on the receiving side of a protocol-29 connection.

- If a symlink/device/special-file changes its value without any
  attribute changes, the itemized event no longer gets dropped.
- We put a 'c' into the checksum/change field now to indicate when
  a symlink/device/special-file changes its value without changing
  its type.  This lets us properly interpret the --copy-links output
  to know which items are getting copied without changes and which
  are getting created with new content.
- Fixed the 'T' itemized output for a symlink when rsync tries to
  set the right time but fails due to lack of OS/disk support.

- Fixed a bug in short-opt parsing when an abutting arg has an '='.
- Allow a short-opt to be separated from its arg by an '='.
- Avoid an IBM-checker warning about an impossible case in a switch
  and a warning about a potential NULL-pointer dereference.
- Fixed a memory leak.

Fixed the munging of non-user namespace xattrs w/--fake-super.
Fixed the sorting of received xattrs when name-munging occurs.
Added xattr tests to verify that these things stay fixed.

rsync xattrs literally).

ftp directory layout.

Added a couple more long options that might get passed.