Merge pull request #49 from opengm/RC-2.3

update from opengm:RC-2.3
Merge pull request #50 from opengm/RC-2.3

update from opengm:RC-2.3
refactoring visitor usage in lazy flipper
refactoring visitor usage in LBP and TRBP
refactoring visitor usage in Multicut, fix bug with constant factor
 comment unused typedef
uncomment callars for refactored methods
Merge pull request #192 from joergkappes/RC-2.3

Refactoring of LF, LBP, TRBP, and multicut