[Ifeffit] New section on ifeffit wiki

Hi all, I've added a user page for me on the Ifeffit wiki, and started a list of tips for analyzing materials that aren't perfect crystals...that's one of the more common questions I get from beginners at workshops or whatever, and it seemed worth having. I've got a little bit on amorphous materials and substitutionally doped materials right now, and plan to add sections on macromolecules and nanoparticles. Feel free to add to (or edit!) the list. Aside from being linked from my user page, I also linked it to the XAFS analysis page. --Scott Calvin Sarah Lawrence College