[perl #45953] [TODO] Replace magic number in mmd_distance()

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# New Ticket Created by  Paul Cochrane 
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In src/mmd.c there is the todo item within mmd_distance() which looks like 
it means that one should replace the magic number.  Here is the code with
context to help the adventurous person who picks up this ticket...

    if (args > n)
       dist = 1000;   /* XXX arbitrary > max_class_depth * n */