Repeat Find Forward
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    Once the search pattern has been defined (Shift F5 or Shift F6),
    you can press this key at any time in any file to find the next
    occurrence of pattern.  I decided to use two sets of functions to
    perform searches.  Once I found a pattern, I might do some editing
    and then find the next occurrence.  I hate to define the search
    pattern over and over or set the search direction over and over.
    This function does a wrap search - when it reaches the eof it
    starts over at the beginning of the file.