section and structure added
added 'problems' and some more structure
bla
Merge branch 'master' of https://github.com/SPSS13/SPSS13

Conflicts:
	SDD/ISGCI-JGraphT.aux
	SDD/ISGCI-JGraphT.log
	SDD/ISGCI-JGraphT.pdf
	SDD/ISGCI-JGraphT.synctex.gz
foo