[tei-council] idno -> ptr

[Syd Bauman]

> Good catch.  I've reopened https://sourceforge.net/p/tei/bugs/527/ .

This has nothing to do with 527. It's a pandemic stylesheet error, I'm
pretty sure. (Happens in any chapter; I don't think it was happening
yesterday, BTW.)

IMHO it is release-blocking. I won't have time to look for the problem
until tomorrow. But someone else may have already solved it by then.