Merge pull request #51 from opengm/RC-2.3

update from opengm:RC-2.3
Merge pull request #52 from opengm/RC-2.3

update from opengm:RC-2.3
bugfix wrong usage of macro
change visitor
change visitor
readd dualdecomposition to cmd tool
stop if procress is small
bugfix
add hypertree-solver for subproblems
add hypertree-solver for subproblems
bugfix handling of workingstate when stoped by visitor
Merge pull request #199 from joergkappes/RC-2.3

Rc 2.3