EZP-23345: fix rendering of headings inside table
EZP-23345: fix generating TOC hash
EZP-23345: fix rendering of style attribute
EZP-23345: test table rendering
EZP-23345: fixed RichText ezxml to docbook conversion
Merge pull request #1000 from ezsystems/fix-EZP-23345-ezxml-table-heading-level

Fix EZP-23345: headings inside tables are rendered with incorrect level