v3.10.0

• Fix a bug of Paragraph.set_span() when using an offset argument of zero (the Span was not created). Added 3 methods related to searching strings in paragraphs: search_first(), search_all() and text_at(). These methods permit to search some string with regex in a paragraph and get their position, text_at() returns the text content at a given position.
• Fix the "pretty" option of Document.save(). "pretty" is now the default for odfdo-folder.