Merge remote-tracking branch 'cus/stable'

* cus/stable:
  libzvbi-teletextdec: propagate errors generated in page handler
  libzvbi-teletextdec: dont ignore memory allocation error silently
  libzvbi-teletextdec: output ass subtitles instead of plain text
  ass: move text_event_to_ass from textdec.c to ass.c and export it
  ass: fix error handling in ff_ass_add_subrect
  ass: factor out ff_ass_bprint_dialog
  libzvbi-teletextdec: use AVBPrint for whitespace cleanup
  libzvbi-teletextdec: use option constants instead of strings
  libzvbi-teletextdec: fix indentation after last commit
  libzvbi-teletextdec: support multiple teletext pages in a single packet

Merged-by: Michael Niedermayer <michaelni@gmx.at>