rsync changes since last release

  BUG FIXES:
  
    * Fix "forward name lookup failed" errors on AIX 4.3.3.  (John
      L. Allen, Martin Pool)

    * Fix compilation on Tru64.  (Albert Chin, Zoong Pham)

  INTERNAL:

    * Many code cleanups and improved internal documentation.  (Martin Pool, Nelson
      Beebe)

    * More test cases.  (Martin Pool)