Merge pull request #46 from opengm/master

update from opengm:master
hotfix AD3 bound
Merge branch 'master' of ssh://github.com/joergkappes/opengm
add missing transformation, add cut up for numerical statility
add status message when optimization failed
fix marco excludig DDsubGrad in cmd-tool
fix call of visitor
Merge pull request #179 from joergkappes/master

minor changes