Provide API that returns character count in //body//note && /data/meta//text()

[skurzinz]

reasoning: For claiming editorial work in a copyrights holders association context.

A DSE is not a thing for .de|.at copyright law, but a scientific edition is. The auctorial part is

• most note content (excluding the case of re-edited editions where original notes are first-level auctorial)
• front/back (as long as it is not an index/table of sorts -- indices do not count)
• all text that (by dsebaseapp 'standards') goes into /data/meta (e.g. paratexts like introductions, "about this edition", etc.)