"refuse options" value.  Also changed the idiom used to mark refused
options in the popt struct.

identified what was wrong.

- Don't use the NGROUPS_MAX define.

- The do_mkstemp() routine now preserves the errno value from fchmod()
  if that call fails.
- Improved the CHECK_RO macro stuff.

shouldn't generate a path with a double-leading slash anymore.

to do when the root of the transfer was "/").

protocols are no longer supported.

should be minimized.

- Optimized the keep_backup() code.

pointer is no longer valid.

output in older rsync versions).

avoid core-dump.

build-farm machines.

if flist->hlink_pool isn't set (instead of neglecting to read the idev
info).