[idn] homographs of the delimiters aka syntax chars

[Erik van der Poel]

I've added a table of protocols (DNS, URI and email) with their 
delimiters to the doc at:

http://nameprep.org/
Please send me your additions.
Also, readers on this list may be interested to see:
http://www.unicode.org/reports/tr36/tr36-2.html
This doc calls them "syntax characters".
Erik