[MERGE] change extension of generated html documentation from htm to html (was: Re: [RFC] doc directory reorganisation & I18N)

[Ian Clatworthy]

Ian Clatworthy has voted tweak.
Status is now: Conditionally approved
Comment:
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For details, see: 
http://bundlebuggy.aaronbentley.com/request/%3C46B1B4C3.60708%40ukr.net%3E