[phobos] CustomFloat

[David Simcha]

Robert Jacques (who I know offline and, in fact, was the person who 
introduced me to D) has massively improved/debugged CustomFloat and 
asked me to post it for review and commit it to Phobos.  See the 
attached file.  If everyone's happy with it, I'll replace the current 
impl in std.numeric and check it in.
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