Re: [web-annotation] (model) vague definition of character position for text position selector

Have added this text for now, and will replace with better text 
provided by i18n when available.
```
<p>The selection of the text MUST be in terms of unicode code points 
(the "character number"), not in terms of code units (that number 
expressed using a selected data type). Selections SHOULD NOT start or 
end in the middle of a grapheme cluster.  For more information about 
the character model of text used on the web, see [[charmod]].</p>
```


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Received on Thursday, 26 May 2016 22:19:30 UTC