Powerpoint writer: Handle (sub)headers above slidelevel correctly.

Above the slidelevel, subheaders will be printed in bold and given a
bit of extra space before them. Note that at the moment, no
distinction is made between levels of headers above the slide header,
though that can be changed. (It has to be changed in pandoc, since
PowerPoint has no concept of paragraph or character classes.)

This allows us to clean up the code as well: the code in
`blockToParagraphs` since it will only touch content blocks, and
therefore will not deal with headers at or below the slidelevel.

0 files changed, 0 insertions, 0 deletions