[NTG-context] interim fix for aesc-like macro

I found an interim fix for the \ae macro in the schemata: put the word with the macro in an hbox, and the problem goes away. I wonder what the mechanics behind that are. I tend to have weird documents with dead languages. Who knows, maybe I want to cite Aelfric using Old English letters or Sir Gawain or whatever Middle High German with a yogh or similar glyph. Come to think of it, Gothic would be cool, too. So, figuring out the mechanics would be helpful. Thanks, Charles