We (soon will) support the XLSForm name setting

[jnm]

Once kobotoolbox/kpi#5137 is part of a release, we may want to note somewhere that we honor the name setting in XLSForm, or remove language saying that we do not support it (because previously we didn't!)

[tiritea]

FWIW I'm not sure we ever say anywhere that we dont support it (at least I never ran across anything, till I actually tried it and found it was getting clobbered). We might consider adding a comment to the next release notes to say something like "Kobo now supports the XLSForm name setting; see https://xlsform.org/en/#specify-xforms-root-node-name". But for the most part I dont think the vast majority of Kobo users ever knew it existed or why you even might need it, so the de facto XLSForm spec documentation might suffice.