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Remove deprecated table markup from CKeditor HTML

Goal: disallow cellspacing, cellpadding and border attributes on <table>
tags in CKeditor markup. This is deprecated HTML and interferes with
table rules in Bootstrap and other CSS libraries.
Fix: allow all content (as the "CKEDITOR.dtd" object) , then disallow
specific attributes on the <table> tag.
Merge pull request #1712 from gowestweb/candidate

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