rename "textorder" metadata to "text-order"

Use “text-order” or “textorder” (for retro-compatibility) metadata if defined to order the texts of a corpus.

(from redmine: issue id 2937, created on 2020/11/09 by Matthieu Decorde)

added import type::task + 1 deleted label

changed milestone to %TXM 0.8.2

The new name seems to be already implemented in TXM 0.8.1.202102250837.
The old name (textorder) should also be recognized for the sake of compatibility with the metadata of corpora designed for previous TXM versions.

(from redmine: written on 2021/03/08 by Alexey Lavrentev)

note: the text-order (and textorder) feature is only available in the XTZ and TRS imports

(from redmine: written on 2021/07/16 by Matthieu Decorde)

closed

assigned to @mdecorde