[NTG-context] bib module: support \noopsort

Hello Taco, would it be possible for your module to support the \noopsort command you can find in some .bib files? Basically, a key like key = {\noopsort{value1}}value2 will print as value2 but be sorted under value1 (details in the bibtex references? For the time being I'm just putting a \let\noopsort\relax in my document. -- Giuseppe "Oblomov" Bilotta