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Powerpoint writer: use reference-doc font for captions. (#10835)
Change reference.pptx to use 16:9 aspect ratio.
PPTX writer: keep tables and surrounding text on same slide (#11411)
Powerpoint writer: avoid extra blank lines before author.
PPTX writer: support notes field in metadata for title slide (#11396)
pptx: Fix list level numbering
pptx writer: Handle reference doc without slides (#11310)
pptx writer: Handle single column
pptx: Restructure tests