Gregofacsimil + neumes from H + rsigns according to H. Verse from H. Text adaptations: +me in V/; BR has "ergo in me" but H's "in me ergo" is fine. "consecrationem"->"dispensationem" to fit BR, because the meaning is different (musically trivial). TODO replace saM1 with the correct code once it exists: virga, tilde, virga episemata.

Backported most of dcrochu's changes.