[Help] All files conform to XHTML
[Help] Restructure directory structure

* This conforms to ePub structure
[Help] Add class="pagebreak" to HTML files
[Help] Improve docgen builder

* Much better system
* Looks for "class=pagebreak" for MS Word page breaks
* Inserts cover here
[Help] Give space for tip image

* MS Word eliminates the leading spaces
[Help] Better tip image
Merge branch 'help_improve'