add author:spelling field
maninka.gram: remove affixes written separately in nko
daba2vert: update for nko

    - convert opption to save converted form in the first field
    - update INFLECTION morphemes list
maninka.nko gram: parse with tones

    - tone all affixes (to parse latin conversion results correctly)
    - rename file to maninka.nko.gram.txt
parser: 'ignore tones' option