in inc-recursive mode.
- Clean up a relative name to remove interior dot dirs and extra
  slashes.
- Fixed the error output about /../ in a -R path after a /./ cut-off.
- Changed the starting ndx value to 1 so that a dot-dir flist can
  use 0 to refer to its parent (".") directory.

a few extra cleaning options (all off by default).

- Changed struct relnamecache's "is_dot_dir" member to "name_type".

untrusted symlinks in the transfer.

user-specified mount points in inc-recursive mode.

--copy-dest use a temp file when not in in-place mode, and has
various improvments for the code.  I have also "#if 0"ed the code
in the receiver that makes missing directories to see if we can
figure out if it is needed (and if so, what for).

often when overwriting a shorter file.

contents of the module's root directory.

overload.

source path with --relative.

defined.

the generator gets a chance to finish the hard links.

the newer, recommended method.  (Couldn't switch uid_t and gid_t.)

- Got rid of some unneeded blocking_io value twiddling.
- Send --use-qsort to the server if it was specified.