Hi Everybody,

The if-empty combinator was quite a success, so I went ahead and added  
if-zero as well.

 From the (split) word,
dup zero? [ drop ] [ tail ] if    ->    [ tail ] unless-zero

Also, the pattern '10 swap ^' also came up a few times so this word is  
now 10^ and lives in math.functions.  There's also a log10 word now in  
the same place.

Happy factoring,
Doug

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