Re: Docs: Extended.lyx: added discussion about making an index

[Asger K. Alstrup Nielsen]

> Still twiddling my thumbs at the observatory. I added a brief discussion
> about making an index to Extended.lyx. I didn't see any other
> discussion except in Reference.lyx, so I took the liberty of adding it. 
> Enjoy.

I hope you keep being bored up there ;-)

Greets,

Asger