[DECtalk] Update to competition rules

[Tony Baechler]

Hi again, I forgot to mention one thing.  All works must be previously 
unreleased.  That means that it must be an original creation for this 
contest.  If it is already on a public download site, it doesn't count.  
This way authors don't just rerelease stuff they've already done.  The 
point is that it should be your own original, new created work.  Use 
your imagination and creativity.  It can be anything as long as it is 
original, doesn't violate copyrights and is not of an adult nature.  
Just don't pass off something as new that was already released.  Old 
works that were previously released will be disqualified and votes for 
them will be ignored.