Python-petpptx

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- Add SlideLayouts.remove() - Delete unused slide-layout
- Add SlideLayout.used_by_slides - Get slides based on this slide-layout
- Add SlideLayouts.index() - Get index of slide-layout in master
- Add SlideLayouts.get_by_name() - Get slide-layout by its str name

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- Feature 395 DataLabels.show_* properties, e.g. .show_percentage
- Feature 453 Chart data tolerates None for labels

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- Fix 436 ValueAxis._cross_xAx fails on c:dateAxis

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- Add _Cell.merge()
- Add _Cell.split()
- Add _Cell.__eq__()
- Add _Cell.is_merge_origin
- Add _Cell.is_spanned
- Add _Cell.span_height
- Add _Cell.span_width
- Add _Cell.text getter
- Add Table.iter_cells()
- Move pptx.shapes.table module to pptx.table
- Add user documentation 'Working with tables'

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- Add Chart.font
- Fix 293 Can't hide title of single-series Chart
- Fix shape.width value is not type Emu
- Fix add a:defRPr with c:rich (fixes some font inheritance breakage)

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- Add Picture.auto_shape_type
- Remove Python 2.6 testing from build
- Update dependencies to avoid vulnerable Pillow version
- Fix 260, 301, 382, 401
- Add _Paragraph.add_line_break()
- Add Connector.line