[idn] homographs of the delimiters aka syntax chars

[Erik van der Poel <erik@vanderpoel.org>]

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