EPUB export: handle headings inside sections

On one hand, we don't want to split inside a section as there might be
elements we need to close/open at split boundary, OTOH this is currently
not a problem as we don't produce any output for sections.

So remove the level management for sections (this way allowing headings
to split inside sections), let's get back to this when there is a
concept how e.g. multiple columns would be represented in EPUB.

Use case is when sections are used to just group paragraph together and
mark all of them read-only: in this case it's unexpected that headings
are handled differently to not-in-section ones.

Change-Id: If419624f8eec4a6f676ad7f186484c0035f62626
Reviewed-on: https://gerrit.libreoffice.org/43482
Reviewed-by: Miklos Vajna <vmiklos@collabora.co.uk>
Tested-by: Jenkins <ci@libreoffice.org>

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