Restructure feltor.tex putting magnetic first
Restructure feltor.tex putting magnetic first

This should improve readability because definitions are together

feltor-dev/feltor,feltor-dev/feltor,mwiesenberger/feltor,mwiesenberger/feltor,feltor-dev/feltor,feltor-dev/feltor,mwiesenberger/feltor,mwiesenberger/feltor