Fixes bug 8020.

This allows the same rsyncd.d directory to be used for a set
of merge files (*.inc) and a set of include files (*.conf).

The code now avoids any special internal meaning for uid/gid -1, which
allows it to be mapped to a better value (use 4294967295 instead of -1
as the ID to map).  Replaced atol() with something than can return a
value > 0x7FFFFFFF and that will error-out if the value overflows.  If
chown() is called with a uid or gid of -1, complain that the ID is not
settable and signal a transfer error.  Fixes bug 6936.

(If our POSIX types aren't valid, we can't handle the ACLs.)

Fixes bug 7957.

The I/O code can receive incremental file-list chunks during deletion,
and their OPT_EXTRA fields would get corrupted when file_extra_cnt is
incremented.

Instead of temporarily enabling uid_ndx to find out whether the user
owns a file, have make_file() set a flag for that purpose.

Applied with a few minor tweaks by Wayne.  Fixes bug 7936.

when sending a sequence of zeros.

and add missing break in --inplace same-offset loop.

in hosts deny/allow config settings.

Make OS X avoid xattr access on device/special files.
Fixes bug 5458.

Fixes bug 7070.

Fixes bug 6588.

Fixes bug 6576.