[osis-core] Remove <chapter> as a child of <verse>

[Todd Tillinghast]

I agree with Chris' statement below that we should not let chapters
split verses.  

Is there any one who has an objection to NOT allowing <verse> to have a
child <chapter> element?

<snip>
> 
> I agree, we shouldn't let chapter split a verse.  But it can split
> paragraphs.  Even in the NRSV, there is a chapter end/start in
> mid-paragraph, but between verses, like so:
> <chapter 12>...<p>...<verse 17>...</verse></p>
> <p><verse 18>...</verse></chapter>
> <chapter 13><verse 1>...</verse>......</p>
> 
> In the NIV & NASB, the chapter break occurs mid-paragraph and the
> paragraph break occurs mid-verse, like so:
> <chapter 12>...<p>...<verse 17>...</verse></chapter>
> <chapter 13><verse 1>...</p><p>...</verse>......</p>
> 
> Both would appear to require <chapter> inside of <p> for milestone
> purposes.
> 
> --Chris

Todd